Luke becomes friends with a curmudgeon old neighbor, which does not please Phil and Claire. Meanwhile, Gloria and Manny try to get Jay to join them at the symphony, but in an attempt to avoid the concert, he instead ends up with Mitchell and Cameron on their "boys' night out" while Haley babysits for Lily.

Gloria persuades Jay to commit to a night of salsa dancing after seeing how much his friend Shorty and his girlfriend do together. Meanwhile, Cameron makes a bet that he can get a woman's phone number at the bar, and Phil builds a tree house for Luke.

When Gloria's mother and sister visit, they bring traditions, baby names and family baggage; Phil helps the kids with their problems; Mitchell and Cameron try to correct Lily's bad habits.