Monica Geller altered the trajectory of the entire series, having life-changing effects on its characters. Summarizing the role of Monica in the series, Martin Gitlin wrote in his book "The Greatest Sitcoms of All Time" that while her friends "were ... just out to make the most of their social lives", Monica "sought to keep the others in line" while searching for "Mr. Right", who surprisingly turns out to be close friend Chandler. Several years before Monica and Chandler became romantically involved, Cox once joked in an interview that if her character were to ever have sex with another main character, it
Brother and Sister Sister is categorized as its own type as number 450, "the brother and sister". Another of this type is The Lambkin and the Little Fish. At times, Brother and Sister has been confused with Hansel and Gretel, which has also been known under the alternate title of Little Brother and Little Sister. The Grimms selected Hansel and Gretel for the tale by that name and kept the Brother and Sister title for this tale. Some publications of the Hansel and Gretel tale still use the Little Brother and Little Sister title, causing confusion for readers. The story as told by