Fill in the gaps with the given words

1.
— Is she your sister?
— Yes, ... is.
2.
— How old ... she?
— She's eight years old.
3.
— Is ... your grandfather?
— Yes, he is.
4.
— How old is he?
— ... sixty-seven.
5.
— Is he your brother?
— No, he ... . He's my cousin.

6.
— Is it your cat?
— No, ... isn't.