Who are they? (primos)
They are my cousins.
Who is he?
He is the grandpa / grandfather.
Who are they? (hermanas)
They are my sisters.
Who are they ?
They are my grandfather and grandmother.
Who are they? (hermanos)
They are my brothers.
Who is he?
This is the brother.
Who is this in my family?
This is my grandma.
Who is she?
She is the sister.
Who is he ?
He is a baby.
Who are they ?
They are my mother and father.