Exercise 2.9 John is son of Mr Green, he is his son. John is Mrs Green's son, too. John is Ann's brother, Ann is his sister. Mrs Smith, Mrs Green's sister, is aunt of John and Ann, John and Ann are her nephews. Mr and Mrs Black are Mrs Green's father and mother; they are grandfather and grandmother of John and Ann and father-in-law and mother-in-law of Mr Green. John and Ann are hepnew and niece of Mr Green and cousins of his children. Parents and children are a family.