Grace is apoplectic when she catches Will's philandering father on the arm of a glamorous stranger, but she gets even more worked up when she tells Will -- and he's happy living with denial. Speaking of cheaters, Karen misunderstands Grace and suddenly suspects that her husband Stan is having an affair, so she sets out to even the score.

Grace is apoplectic when she catches Will's philandering father on the arm of a glamorous stranger, but she gets even more worked up when she tells Will -- and he's happy living with denial. Speaking of cheaters, Karen misunderstands Grace and suddenly suspects that her husband Stan is having an affair, so she sets out to even the score.

Will & Grace try to lure Tina, Will's dad's mistress, away from Will's father by setting her up with another man. Unfortunately the only man available is Will's gay friend, Larry. Also, Karen buys a horse for breeding, but the stud is more interested in stallions.

Responding to the pleas of his father's mistress-turned-girlfriend Tina, Will attempts to discover whether there is a new woman in his dad's life. However, when his father's new mistress turns out to be his mother, Will must find a way to break the shocking truth to Tina. Meanwhile, Elliot's decision to try out for his high school cheerleading squad has Jack all smiles as he is determined to help his son make the team.

Friends and family gather for the funeral of Will's father. At the reception everyone shares with Will fond last memories of his father, while Will's last memory of his father is not as pleasant. Marilyn helps him realize the changes needed in his life.