Isobel and Betty Rickets are twins. Almost everything about these middle- aged sisters is the same. They both have short, wavy black hair, brown eyes, and 1 round faces. They both are of average height and weight and wear glasses. They always wear the same clothing, too. Isobel and Betty live next door to each other. Their houses look the same. The houses have the same floor plan and the same furniture. The furniture is in the same 2 place in both houses. Only one thing is different about the houses the addresses. Isobel's and Betty's clothing looks alike, their houses look alike, and their husbands look alike, too. They are married to twin brothers. Their husbands' names are Marty 3 and Mackall. Each couple has three children. The children are cousins, but they feel like brothers and sisters.