Who's this/that?
Who's that? It's my sister.
How old is he/she?
How old is she? She's eighteen years old.
Who's this/that?
Who's this? It's my brother.
Who's this/that?
Who's this? It's my father.
How old is he/she?
How old is he? He's nineteen years old.
How old is he/she?
How old is she? She's twelve years old.
How old is he/she?
How old is he? He's fourteen years old.
Who's this/that?
Who's that? It's my mother.