Who's she?
She's a girl. / She's my sister.
Who's he?
He's a baby.
Who are they?
They are my siblings.
What is it?
It's a cat.
Who are they?
They are my sisters.
Who's he?
He's my grandfather.
What is it?
It's a dog.
Who's she?
She's my grandmother.
Who's he?
He's a boy. / He's my brother.
Who are they?
They are my parents.
Who are they?
They are my grandparents.
Who are they?
They are my brothers.