After Vicky and Dave have a car accident, they decide it's time to revisit their living wills and other legal documents. They also decide to ask their friends Jeff and Mindy to be guardians of their children if they ever become incapacitated. Jeff and Mindy explain that they can't accept because they've already agreed to do the same thing for other friends. Disagreements start to flair up between Vicky and Dave once they start working with an attorney, and they end up having a big fight. Larry finds a draft of a post-nup agreement and assumes his parents are getting a divorce. To save their family, he and the other kids set a "parent trap" to force Dave and Vicky back together.

With Hillary's graduation only three weeks away, David and Vicky plan her graduation party, only to find out she may not even graduate because she's failing her gym class. Luckily, Dave is able to convince the principal to give her another chance, and volunteers to become Hillary's personal fitness trainer so she can pass. Meanwhile, Vicky is fed up with the lack of spontaneity in her and Dave's relationship, and she suggests that he get a vasectomy. Not wanting to go through the procedure alone, Dave suggests that Vicky get her tubes tied as well. However, both are in for a surprise when they try to outsmart one another. Meanwhile, with Mike's help, Larry and Kenny plan a school prank to get revenge on the seniors who have been harassing them.