УМАЛЯЯЯЯЮ noun singular + 's Who's John? He's Sue's brother • plural noun + -s' Whose uncle is Mark? He's the girls' uncle. • irregular plural noun + 's This is the men's house. • We use who's to ask about a person. • We use whose to ask about possession. 5.56 Ask and answer. 3 A: Who's Sam? B: He's Helen's husband. Whose mum is Ann? A: She's Sam and Mary's mum.