<P> Since the first season, Jack has established a close bond with alcoholic socialite Karen Walker (Megan Mullally), who chooses to work merely as a source of distraction . Karen is his closest female friend, and they bond due to their shared narcissism and materialism . Jack also strikes up a friendship with Will's other best friend Grace Adler (Debra Messing), through association with Will and Karen . </P> <P> In the pilot episode, Jack is living with Will while his floors are re-done, but has to find somewhere else to live when Grace moves in . At the end of season one, Jack agrees to marry Karen's maid Rosario (Shelley Morrison) in order to secure her green card . Jack lives with Karen for the entirety of season two, but after a year together, the marriage is annulled when Rosario wants to marry Karen's gardener . Therefore, at the end of season two, Jack moves in with Will, but when Will takes Grace in after an attempted burglary at her apartment, Jack agrees to sublet Grace's apartment--although Will, Karen, and his mother pay the rent . (In "Moveable Feast Part 1," it emerged that each of the three pays one half of the cost, meaning that Jack is actually collecting one and a half times the actual amount of his rent .) </P> <P> In season three, Jack undertakes a search for his biological father, which ends when he discovers that his father died several years back . Jack does, however, meet Elliot (Michael Angarano), his own biological son, whom he fathered by depositing at a sperm bank as a teenager so that he could buy a leather jacket . He later discovers that the boy's mother Bonnie (Rosie O'Donnell) is a lesbian; she was a nurse at the sperm bank who stole Jack's deposit and was inseminated with it . </P> <P> Jack's most consistent vocation results from his taking over the class of his acting teacher Zandra (Eileen Brennan) after she is fed up with his lack of talent . After taking everyone's money and leaving, another student (Stacy Keach) takes over the class and begins teaching the "McFarland method" ("acting is attracting") without Jack's knowledge . He also trains to be a student nurse, but ultimately gives it up when, during Karen's fourth wedding, he meets Jennifer Lopez and becomes her back - up dancer (and, for a short time, Janet Jackson's back - up dancer), a career that fizzles as well . </P>

How did jack on will and grace have a son