After accidentally killing his daughter's pet fish, divorced dad Jim turns to his ex-wife and her new boyfriend to secretly find a replacement goldfish, testing the trio'd unconventional co-parenting dynamic.
Jimmy gets addicted to a violent video game and Grace refuses to study trigonometry because it's not useful. Their divorced parents react ineffectually and also squabble with each other; even Trey is ineffectual although he is a wealthy Black graduate of M.I.T.
Jim, Trey, and the kids are driving home from a concert when Jim gets pulled over for speeding, but Trey's presence in the car gets them out of it; Jim wonders if Trey's lifestyle could hold bad consequences for the kids.
Trey is in charge of the Nest for an evening, but when Grace asks to have a friend over, Jim abandons his plans to help navigate the unpredictability of sleepovers.
The Boston Celtics are going through a losing streak, which leads to a lean period in Bobby's sports bar, so Jim loans him some money to cover expenses.
Julia helps get Jim out of a jam by lying to get his friend's daughter into an exclusive private school; Bobby and Grace go shopping at a thrift store.