Kim isn't happy to hear that Greg's mother will be staying with them for four days, as all Natalie does is make boring small talk with her. Natalie shows up with Tom -- who wasn't supposed to be coming -- because she was worried he'd forget to take his blood pressure medication if she left him home alone. While Kim has to contend with listening to Greg's mother's chit chat, Greg has to contend with seeing his mother boss his father around like a child. Greg tells Jimmy about it, worried how Tom no longer fights back. Jimmy recommends Greg spring him for a day, so Greg invites both men to a Vegas vacation this weekend. He tries to ask his mother for permission first, but when she says Tom can't go, Greg goes behind her back and takes him anyway -- which angers both wives when they find out their husbands left without telling them. Greg and Jimmy take Tom to an amazon jungle exhibit, where Greg soon realizes that his mother has spoiled his father so much that he doesn't know how to do anything for himself -- and he really is a child. After Tom has dessert for lunch, loses his and Greg's room keys, gets lost, falls asleep by the pool, forgets to wear sunscreen, gains a bad sunburn, wanders into an animal cage, and winds up attacked by monkeys, Greg learns not to disturb the ways of nature. Meanwhile, Christine decides to help Kim with Natalie by coaxing the woman into talking about interesting things. They both get more than they bargained for when Natalie's story about kissing Ringo Starr leads straight into detailed discussion about how much trouble she and Tom have in bed.