It's wrong to hang out with a family member's ex.
Paul's sister divorces her cheating husband Jeff, but then Paul gets a reminder about his monthly golf game with Jeff.
Paul wants to respond to the reminder.
Paul cancels their monthly game out of loyalty to his sister.
Paul decides to continue meeting his ex brother in law for golf.
Paul is able to show his sister the support she needs.
Paul's relationship with his sister becomes strained when she realizes he is still in touch with her ex.