They are (She) cousins.
They are her cousins.
He is (You) grandpa.
He is your grandpa.
This is (You) daughter.
This is your daughter.
We are (She) friends.
We are her friends.
You are (He) granny.
You are his granny.
This is (She) aunt.
This is her aunt.
This is (You) mum.
This is your mum.
They are (He) parents.
They are his parents.
He is (I) uncle.
He is my uncle.
They are (I) sons.
They are my sons.