Robbie Douglas is practically engaged to his girlfriend Joanne, and when they discover how their friends are both successfully attending university while raising a baby they begin to think that perhaps teen-aged marriages are workable.

Robbie Douglas learns how much of a pest a younger sibling can be when Chip and a buddy break up his date with a pretty girl by eating appetizers and otherwise making a nuisance of themselves. The next afternoon, for revenge, Robbie primes his other brother Ernie to haunt Chip and his date.