Полное задание выглядит так:
1) Susan Barker is (William) wife.
2) Richard Barker is (Margaret) husband.
3) Jim and Don are (John) brothers.
4) Sally is (John) sister.
5) John and Sally are (Jim), (Mary) and (Don) cousins.
6) William is (Richard) brother.
Ответ:
1) Susan Barker is William's wife.
2) Richard Barker is Margaret's husband.
3) Jim and Don are John's brothers.
4) Sally is John's sister.
5) John and Sally are Jim, Mary and Don's cousins.
6) William is Richard's brother.