Is he a grandma? (grandmother)
No, he isn't. He is a granddad (grandfather, grandpa)
Who's she?
She is a mum (mother)
Have you got a brother?
Yes, I've got a brother (Yes, I have)
Who's she? Who are they?
She is a sister. They are twins
Who is he?
He's a dad (father, daddy)
Rodzeństwo po angielsku to?
Siblings
Who's he?
He is a brother