The boys are really excited when their grandfather comes by for a visit, they all have a great time but Grandpa Mike makes some promises he cant keep.

Lloyd's RV-driving mom visits the garage. At the same time, Joe is pushing Andy to enter in a pine-box derby -- to prevent a business rival's son from beating Matt's previous winning record.

Andy figures he won't get into any more trouble in school if Joe dates his teacher. Claire meets a potential date at the supermarket and psychology student Matt fears he may have obsessive-compulsive disorder.