<P> In the first season she hands Booth the file on her parents' disappearance and he agrees to look into it as a personal favor . It is later revealed in Season 2 that her parents, who were bank robbers specializing in safety deposit boxes, changed the family's identity after they stole some damaging FBI documents regarding the murder of an FBI agent and the false imprisonment of civil rights activist Marvin Beckett . Brennan's birth name was Joy Keenan . Her mother (real name Ruth Keenan, known under the assumed identity of Christine Brennan) had hoped to someday return to her children and family, but made a tape for Brennan to watch on her 16th birthday in case that never happened . Brennan later discovered that Ruth / Christine was murdered in 1993, two years after she and her husband went on the run . </P> <P> Her father Max Keenan re-entered Brennan's life when she and her brother were being threatened by an old acquaintance, who turned out to be Booth's boss, Deputy Director Kirby . Max evades capture after killing Kirby, and takes Russ into hiding to protect him . Later, Max allows Booth to arrest him in order to improve his relationship with his daughter . At trial, Max is acquitted of murdering Director Kirby (due in large part to a defense Booth indirectly came up with, positing an alternate theory of the crime in which Temperance was the killer instead, creating reasonable doubt), and he begins to rebuild his life . </P> <P> He temporarily works at the Jeffersonian as a guide for children visiting the place and demonstrates his brilliant talent as a former science teacher . However, Brennan is concerned about a convicted felon having access to a lab that investigates crimes . Max also introduces Brennan to her cousin Margaret Whitesell, portrayed by Deschanel's real - life sister Zooey Deschanel . </P> <P> Brennan is best friends with her coworker, Angela, saying in the 6th - season premiere she loves Angela "like a sister" and is going to be an aunt to Hodgins' and Angela's newborn child . It is revealed at the end of the season six finale "The Change in the Game" that Brennan is pregnant and the father is Booth . </P>

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