Family
A family (also described as a familial connection or ohana) was a social unit between people by genetics, marriage, adoption, or an especially strong friendship. Those in a family were typically described as relatives; those that lived prior to an individual were known as ancestors, while those that lived after an individual were known as descendants.

The , as a  starship, carried a number of families as part of its regular complement. This was much to the chagrin of Captain Jean-Luc Picard, who did not consider himself a family man. The ship's saucer separation function was intended in part to protect the families on the vessel by allowing them to flee to safety when the vessel entered combat situations. () In an alternate timeline in 2366 in which the United Federation of Planets was at war with the Klingon Empire, Guinan noted the absence of families on the vessel to Jean-Luc Picard. She stated to him that there should be children on the ship, to which he replied that they were at war. To this she replied that they were not supposed to be, that the vessel was a ship of peace, not one of war. ()

In 2374, Seven of Nine said the need for familial connections was a weakness. () Later in 2376, Seven of Nine evolved to believe that she and Naomi Wildman said they considered each other family because they were very close friends. () The study of these family relationships was known as genealogy. () 

Crews of some starships considered themselves family. In 2259 of the alternate reality,  expressed his joy that a newly fatherless  would be a part of the 's family as a regular crewmember, not merely a specialist on temporary assignment to the ship; Marcus remarked that it was nice to have a family. ()

In 2287, Leonard McCoy wondered aloud why he, James T. Kirk, and Spock spent time together on shore leave, despite serving together on the Enterprise-A, and especially given their mutual antagonism of each other, remarking that other people had families (who they spent time with). Kirk agreed that other people did, but not them. After Kirk later referred to Spock as his brother, whom he lost but had later regained, McCoy noted the inconsistency between that comment and Kirk's earlier one about them not having families. Kirk admitted that he had been wrong about that (i.e. they did have families – each other.) ()

In 3189, Michael Burnham asked Su'Kal what he knew about families. He answered, "Families are where children are nurtured and loved and taught the norms and rules of the society in which they are raised." ()

Cultural views 
Familial connections varied by species, culture, gender, sexual identity, and preference. 

Denobulans commonly had several spouses, each of which had more spouses, and children by each. () Bolian families may have likewise been polygamous. ()

According to Kotan Pa'Dar, "On Cardassia, family is everything. We care for our parents and our children with equal devotion.  In some households, four generations eat at the same table. Family is... everything." ()

The Novans named their ancestors "before-family" and "go-befores". ()

Law 
Family members of prisoners detained by the Cardassian Union were not allowed to visit them in prison, but they were invited to the trial and execution. According to Odo, it was done so the public could see them cry over their loved ones. ()

Organization

Direct genetic connections

Indirect genetic and non-genetic connections

Non-genetic familial connections

Appendices

Real-life connections 
 The following Star Trek performers and production staff members share real-life familial connections:
 Paul and Silvia Abascal are siblings.
 Gerald W. Abrams is the father of J.J. Abrams.
 Brian and K. Adams are siblings.
 Jason Leland Adams is married to Alicia Adams.
 Phil Adams is the uncle of Cris Borgnine.
 Greg and John Agalsoff are brothers.
 Edward Laurence Albert was married to Katherine Woodville.
 Jeff Allin is married to Ann Gillespie.
 Alyce and Rhae Andrece were twin sisters.
 Art Anthony is the father of Jasmine Anthony.
 Jamie Arias is married to Gail Arias.
 Michael and Joel Aron are brothers.
 Bill and Bub Asman are brothers; Bill is the stepfather of Tom Gianelli.
 Rick Avery was married to Joni Avery; they are the parents of Brian and Mike Avery.
 Ron Balicki is married to Diana Lee Inosanto.
 Paul Baxley is the grandfather of Craig Baxley, Jr., uncle of Gary Baxley, and the great-uncle of Hunter Baxley.
 Melvin Belli was the father of Caesar Belli.
 Rick Berman is the father of Eddie, Molly, and Tom Berman.
 Casey Biggs was married to Roxann Dawson.
 John Billingsley is married to Bonita Friedericy.
 Randall Bosley is married to Loretta Gordon.
 Jon Jon Briones is the father of Isa Briones.
 Edward R. Brown is the father of Edward Brown, Jr..
 Thomas R. Burman is married to Bari Burman, they are the parents of Barney and Rob Burman, and the grandparents to Barney's son, Anton Burman. He is also the uncle of Ellis Burman, Jr..
 Amick Byram is married to Cassandra Byram.
 Dave Cadiente is the father of Jeff Cadiente.
 Keith Campbell was married to Nicole Randall.
 Michael Canavan is married to Shannon Cochran.
 Jay and Jennifer Caputo are siblings.
 David Carson is married to Kim Braden.
 Chris Casny is married to Gloria Pasqua Casny.
 Michael Cassidy is the father of Mickey and Zane Cassidy.
 Michael Chabon and Ayelet Waldman are the parents of Zeke Chabon.
 Rosalind Chao is married to Simon Templeman.
 Michelle and Rochelle Chelle are twin sisters.
 Jeffrey Chernov is the father of Joe and Max Chernov.
 Anna and Ashley Chiasson are twin sisters.
 Gordon Class was married to Deborah Taylor.
 Julie Cobb is the mother of Rosemary Morgan; she was married to James Cromwell.
 Katie and Kellie Cockrell are twin sisters.
 Laura Connolly is the mother of Amy Kate Connolly; Amy Kate is married to David G. Trotti.
 Mark Correy is the uncle of twin sisters, Candace and Nicole Villwock.
 Chuck Courtney is the father of Dustin Courtney and the stepfather of Lincoln Simonds.
 Mary Crosby is the aunt of Denise Crosby; Denise's sister-in-law is Spice Williams.
 Joseph D'Agosta was married to Barbara Baldavin.
 Mitchell and Steve Danton are brothers.
 B.J. Davis was married to Dorothy Ching-Davis.
 Vince Deadrick, Sr. was the father of Vince Deadrick, Jr..
 John de Lancie is married to Marnie Mosiman; they are the parents of Keegan de Lancie.
 Robert della Santina is the father of Damian Della Santina; Damien is married to Camille Calvet.
 Brett and Nolan Donahue are twin brothers.
 Eddy Donno is the father of Tony Donno.
 James Doohan was the father of twins Christopher and Montgomery Doohan.
 Clay Drayton is the father of Trinity Drayton.
 Doug Drexler was married to Dorothy Duder.
 Chris Edrington is married to Barbara Gaddy-Edrington.
 Carol Eisner is the mother of Sam Klatman.
 Kiante and Ousaun Elam are brothers.
 Zoltan Elek is married to Katalin Elek.
 Lou and Carolyn Elias were siblings.
 Robert Ellenstein was the father of David Ellenstein.
 Gary, Andy, and Tony Epper are brothers.
 Jerry Fleck is the stepfather of Simon Stotler.
 Jonathan Frakes is the brother-in-law of Beth Scott.
 Anthony Fredrickson was married to Penny Juday.
 Paul Ganus is married to Ellen Bradley.
 Ralph Garrett is married to Donna Garrett.
 Allan Graf is the father of Derek Graf.
 Adolphus Hankins was married to Betty Hankins.
 Karl Held was married to Sarah Marshall.
 Eddie Hice was the father of Freddie Hice.
 Chuck Hicks was married to Kaye Wade.
 Grainger Hines was married to Michelle Phillips.
 Emma and Ian Ho are twin siblings.
 Matt Hoffman is married to Tina Hoffman.
 Billy Hank and Buddy Joe Hooker are brothers.
 Antoine and Spencer Holmes are twin brothers.
 Marty Hornstein is the uncle of Ellen J. Hornstein.
 André Jacquemetton is married to Maria Jacquemetton.
 Donald R. and Patrick Jankiewicz are brothers.
 Matt and John Jefferies were brothers.
 Salome Jens is the sister-in-law to Anthony Zerbe.
 Gary, Ben, and Ethan Jensen are related.
 Dean and Starr Jones are siblings.
 Mike Justus is married to Sandy Berumen-Justus.
 Don Keefer was the father of Tom Keefer.
 Werner Keppler is the father of Rolf John Keppler.
 Henry Kingi, Sr. is the father of Dorian and Henry Kingi, Jr..
 Diane and Elaine Klimaszewski are twin sisters.
 Hiro Koda is married to Jahnel Curfman.
 Walter Koenig is married to Judy Levitt; they were the parents of Andrew Koenig.
 Heidi and Alissa Kramer are twin sisters.
 Michael Lamper was married to Marina Sirtis.
 Lane Leavitt is the father of Steven Leavitt.
 Gene LeBell is the father of David LeBell.
 Reuben Leder is the brother-in-law of Gary Werntz.
 Tom and Ted LeGarde were twin brothers.
 Christopher Leps was married to Alex Madison.
 Shari Lewis was married to Jeremy Tarcher.
 Susan Lewis is the mother of Shauna Lewis.
 Justin Lin is the father of Oqwe Lin.
 Kurt D. Lott is married to Jane Austin.
 Tom Lupo is the father of Diana R. Lupo.
 Richard and Barry Lynch were brothers.
 Jon Macht and Stephen Macht are cousins.
 Chuck Madalone is the father of Dennis Madalone. Dennis is married to Linda Colucci; Linda is the sister of George Colucci.
 Kim and Kelly A. Manners are brothers.
 James Mapes is married to Susan Granger.
 Mark Margolis is the father of Morgan H. Margolis.
 Sonequa Martin-Green is married to Kenric Green.
 Benito Martinez and Benita Andre are siblings.
 Patrick Massett is married to Marybeth Massett.
 Maya and Nandy McClean are twin sisters.
 Buck McDancer is married to Sonia Jo McDancer.
 Malcolm McDowell is the uncle of Alexander Siddig. Alexander was previously married to Nana Visitor.
 Vincent McEveety was the uncle of Stephen McEveety.
 Bob and Don Charles McGovern are twin brothers.
 Ernie Mirich was married to Melinda Clarke.
 Michael Moore is the father of David Moore.
 Gary Morgan is the father of Bonnie Morgan.
 Phil and Iona Morris are siblings.
 Kate Mulgrew is the mother of Alexander James Egan.
 Nancy Muñoz is the mother of Mark, Mario, and Michael Muñoz. Michael is married to Marisa Muñoz.
 Kenny Myers is married to Karen Asano-Myers.
 Jennifer and Marcus Nash are siblings.
 Jillana and Paula Neiman are sisters.
 Larry Nemecek is married to Janet Nemecek.
 Leonard Nimoy was the father of Adam Nimoy; he was married to Susan Bay who was, in turn, previously married to John Schuck. Adam is married to Terry Farrell.
 Celina and Kitty Nguyen are twin sisters.
 Julia and Liz Nolan are twin sisters.
 Jerry O'Connell is married to Rebecca Romijn.
 Michael O'Herlihy was the uncle of Gavan O'Herlihy.
 Michael Okuda is married to Denise Okuda.
 Frank Orsatti was the uncle of Noon Orsatti.
 Bobby Parker is married to Rebecca Parker.
 Matt and Mike Perfetuo are twin brothers.
 Fred Phillips was the father of Janna Phillips.
 Charles Picerni is the father of Charles Picerni, Jr. and Steve Picerni.
 Michael Piller was the father of Shawn Piller.
 Robert Pine is the father of Chris Pine.
 Tony Plana is married to Ada Maris.
 Zachary and Joe Quinto are brothers.
 Jade and Nikita Ramsey are twin sisters.
 Heather Rattray and Laird Macintosh are siblings.
 Phil Rawlins is the father of Lex Rawlins.
 Guy Raymond was the stepfather of Hallie Todd.
 Keith Rayve is married to Susan Henley.
 Jeff and Jerry Rector are twin brothers.
 Garfield Reeves-Stevens is married to Judith Reeves-Stevens.
 Mark Reilly is married to Robin Morselli.
 Andrew Robinson is the father of Rachel Robinson.
 Gene Roddenberry was the father of Dawn, Darleen, and Rod Roddenberry; he was married to Majel Barrett.
 Scott Rogers is the father of Zachry, Ella, and Cort Rogers.
 Jimmy, J.P., and Pat Romano are related.
 R.A. Rondell is the father of Ronald R. Rondell; he is married to Debby Lynn Ross.
 David Rossi is married to Lili Malkin; he was previously married to April Nocifora.
 Bill M. Ryusaki is the father of Kimberly L. Ryusaki.
 Geoff and Greg Paul Samuels are twin brothers.
 Joseph Sargent was married to Carolyn Nelson; he was previously married to Mary Carver.
 Alan Scarfe was married to Barbara March.
 Paul Scheer is married to June Diane Raphael.
 William Shatner is the father of Leslie, Melanie, and Lisabeth Shatner; he was previously married to Marcy Lafferty. Lisabeth is married to Andy Clement.
 Armin Shimerman is married to Kitty Swink.
 Alan Sims was married to Deniece Sims.
 Mary Jo Slater is the mother of Christian Slater.
 Herb Solow was married to Yvonne Fern Solow.
 David Soul was married to Julia Nickson.
 Larry and Robert Stachowiak are brothers.
 Patrick Stewart is the father of Daniel Stewart; he is married to Sunny Ozell, and was previously married to Wendy Neuss.
 Hal Sutherland was the father of Keith Sutherland.
 Jeri Taylor is the mother of Alexander Enberg.
 Colleen and Maureen Thornton are twin sisters.
 Lawrence Tierney is the uncle of Michael Tierney.
 Oscar Torre is married to Chuti Tiu.
 Dennis Tracy was married to Roma Lee Tracy.
 Audrey, Chris, and Jerry Trent are related.
 Herta Ware was the mother of Ellen Geer and grandmother of Ellen's daughter, Willow Geer.
 Gary Wayton is married to Monica Staggs; Gary was previously married to Paula Wayton.
 Floyd, Lloyd, and Troy Weaver are triplet brothers.
 Titus Welliver is married to Joanna Heimbold.
 Pat Westmore is the aunt of Michael and Monty Westmore. Michael is the father of McKenzie and Michael Westmore, Jr; Monty was married to June Westmore.
 Grace Lee Whitney was the mother of Scott and Jon Dweck.
 Glenn R. Wilder is the father of Scott Wilder.
 Gerard Williams and Rita Minor are siblings; Rita is married to Bob Minor.
 Tamara and Starr Wilson are twin sisters.
 Robert Wise was married to Millicent Wise. He was the uncle of Douglas E. Wise
 Mary Wiseman is married to Noah Averbach-Katz.
 Dey Young and Leigh Taylor-Young are sisters.
 Herman Zimmerman is the father of Fritz Zimmerman III.

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