Randy returns from Costa Rica for Christmas only to discover the changes that have taken place in his absence and that life has gone on without him.
Tim invites his brother Marty and his twins to live with him when he discovers that Marty and his wife Nancy are separated.
Tim and Jill try to teach Marty the best way to parent when one of the twins keeps throwing tantrums to get her own way.
Tim commissions Mark to make a video to celebrate the completion of his hot rod. When Tim is disappointed with the result, Mark films a new version - with a dance number set to "Greased Lightning."
