Mariano began a relationship with fellow reality TV contestant Amber Brkich in 2003, during their time filming "". They became engaged on May 9, 2004, during the show's live finale at Madison Square Garden in New York City, and married on April 16, 2005 at Atlantis Paradise Island in The Bahamas. CBS aired a two-hour special about the wedding, entitled "Rob and Amber Get Married", on May 24, 2005. After their marriage, Brkich took Mariano's surname, and the couple moved to Pensacola, Florida. They have four daughters: Lucia Rose (born July 4, 2009), Carina Rose (born December 10, 2010), Isabetta Rose (born May 5, 2012), and Adelina Rose (born June 20, 2014). Their entire family are members of the Catholic Church.