<Li> Laila Markus, Grace and Leo's daughter, is played by Maria Thayer . Laila was conceived by Leo and Grace on an aircraft, during a period where her parents were divorced . She was going to be raised by Will and Grace, but her parents remarried shortly before her birth . She appears on screen only during the series finale . </Li> <Li> Warren, played by Jesse Fremont Allis, is the imaginary son of Grace and Leo in a dream that Grace has during the last episode of season 8 . Grace and Will raise' their' son together . </Li> <Ul> <Li> Vince D'Angelo, played by Bobby Cannavale . An Italian - American police officer, Vince first met Will after giving Karen a ticket for speeding and they started dating after the subsequent hearing . Vince was friends with Joe and Larry and began Will's first long - term relationship in the series' run . Vince broke up with Will, requesting time alone after repeatedly losing his job . He re-encountered Will in season 8 and, during the funeral of Will's father, they acknowledged their mutual feelings, thus rekindling their romance . In the finale, Will and Vince are shown to raise a son, Ben, together . 11 years later in season 9 it was revealed that this was part of Karen's dream . </Li> <Li> Marilyn Truman, Will's mother, is played by Blythe Danner . A typical WASP, Marilyn regularly drinks, collects Lladró statues and treats them as if they were her children, and put up with her husband's regular affairs until their ultimate separation . She is not a fan of musical theater--once claiming that Les Misérables was unrealistic because "poor people don't sing that much"--but was impressed with Mamma Mia! . She does not like the jokes Grace and Karen make about Will's sexuality, saying, "Is that a gay joke? I don't like that ." </Li> <Li> George Truman, Will's father, is played by Sydney Pollack . While he and Will have a close loving relationship, of which both Jack and Grace are envious, it is eventually revealed that he had trouble dealing with telling others of his son's sexuality, initially telling his friends Will was married to Grace . He dies in season 8, only days after having a fight with Will in which he admitted he would rather that Will was not gay . </Li> <Li> Sam Truman, Will's brother, is played by John Slattery in season one and Steven Weber in season 8 . He had a falling - out with Will over comments Will made about his wife, but reconciled after he had a one - night stand with Grace . He eventually divorced his wife and gained full custody of their two children . </Li> <Li> Paul Truman, Will's brother, is played by Jon Tenney . Paul never really came to terms with his brother's sexuality and often behaved like a childish bully, belittling and insulting Will . </Li> <Li> Peggy Truman, Paul's wife and Will's sister - in - law, is played by Helen Slater . She was only shown in one episode and came off as waspish and suspicious of Grace's friendly behavior towards her own husband . </Li> <Li> Tina, George's mistress, is played by Lesley Ann Warren . She began a relationship with George while he was still married to Marilyn, but was dismayed to learn that George was then seeing his ex-wife behind her back . Ultimately she and Marilyn come to an understanding, that they will share George between them without him knowing what is going on . This arrangement apparently ended not long before George's death . </Li> <Li> Jordy Truman, Sam's son and Will's nephew, is played by Reed Alexander . Flamboyant Jordan incenses Will, since Marilyn is incredibly accepting of him even though she was not at first accepting of Will . His nickname is Jordy . He is perceived to be gay by the other characters, although he is still a child, because of his flamboyant nature, love of show tunes and musicals, along with his general disposition . </Li> <Li> Casey Truman, Sam's daughter and Will's niece, is played by Kyla Dang . Casey was adopted by Sam and his ex-wife . </Li> <Li> Ben Truman, Will and Vince's son, is played by Ben Newmark . Appearing only during the series finale, Ben was apparently born from a surrogate mother using Will's sperm . Upon going to college, he meets and later marries Grace's daughter, Laila . </Li> </Ul> <Li> Vince D'Angelo, played by Bobby Cannavale . An Italian - American police officer, Vince first met Will after giving Karen a ticket for speeding and they started dating after the subsequent hearing . Vince was friends with Joe and Larry and began Will's first long - term relationship in the series' run . Vince broke up with Will, requesting time alone after repeatedly losing his job . He re-encountered Will in season 8 and, during the funeral of Will's father, they acknowledged their mutual feelings, thus rekindling their romance . In the finale, Will and Vince are shown to raise a son, Ben, together . 11 years later in season 9 it was revealed that this was part of Karen's dream . </Li>

Who plays wills dad in will and grace