WHO'S THAT?
SISTER
WHO'S THAT?
GRANDMOTHER
WHO'S THAT?
GRANDFATHER
WHOSE COMPUTER IS IT?
IT'S TOM'S COMPUTER
WHOSE BIKE IS IT?
IT'S SARAH'S BIKE
WHO'S THAT?
FATHER
WHO'S THAT?
BROTHER
WHO'S THAT?
MOTHER
WHOSE BOOK IS IT?
IT'S LUCA'S BOOK