Who's that?
It's / That's my father.
Who's that?
It's / That's my mother.
Is that your father?
No, he isn't. He's my uncle.
Who's that man?
He's my grandfather.
Is that your mother?
No, she isn't. She's my aunt.
Who's that boy?
He's my cousin.
Who's that girl?
She's my cousin.
Who's that woman?
She's my grandmother.