Marshall, a sweet but bullied teenager, turns to Trevor to fix up his left-wing mom, Hallie (Constance Zimmer), with his boxing instructor, Clint (Lee Tergesen), the sperm donor who made Marshall's birth possible. They are compatible in every way until Hallie discovers that Clint is a Republican and she breaks off their promising romance. Meanwhile, Claire's free-spirited mother, Liv (Julie Hagerty), a woman with a lust for love like Trevor's, moves in with Claire after yet another breakup with her latest boyfriend