Becca and Corky are paired off with other students who must pretend to be engaged for a week to investigate issues of marriage and family life. Meanwhile, Libby's feuding parents hole up at the Thatcher residence.

Drew's younger brother Richard, a lovable family black sheep, breezes into town. The brothers don't get along, but needless to say, the kids love him; and at a time when Corky begins to wonder who'll look after him when his parents die.