英语语法father and mother's还是father's and mother's

英语语法father and mother's还是father's and mother's what are Nancy's father and mother My father and mother’s day Your mother’s father and mother are your g____. My mother's father and mother are my-------- Your father's mother is your_______.and your mother's father Her mother,her father and her.而不是Her mother,her father and s my mother's father( ) 1．Lucy______________________ 6．Mike's father and mother Jim's,and,mother,they're.father (连词成句) Helen knows her father's and mother's_____(爱好) My father's n____is Bill and my mother is Helen.