<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> <P> In Season 7, episode 2 "The Hot Dog in the Competition", Brennan and Booth found out they were having a baby girl . Their daughter, Christine Angela Booth (named for Brennan's mother and her best friend), was born in a stable during the episode "The Prisoner in the Pipe". In the Season 7 finale, "The Past in the Present", key evidence in the death of her friend, Ethan Sawyer, is linked to Brennan . Max convinces her to go on the run along with Christine, saying that if she is arrested, even if she is found innocent, she may never see her daughter again . </P>

When did bones find out she was pregnant