Full House tells the story of two young couples, the Hatfields and the McCoys. Paul Hatfield and his wife Marsha, have been married for three years, and have been living with Paul's mother, until they finally find their ideal home. However, they are unable to meet the mortgage repayments, so they invite Murray McCoy and his girlfriend Diana, who are also in the same situation, to join them and move in with them, contributing to the payment of the house.