Kat: Look! This is my father and this is my mother.

凯特：看！这是我爸爸，这是我妈妈。

Li Yan: Who's this?

李燕：这是谁？

Kate: This is my grandmother.

凯特：这是我(外)祖母。

Li Yan: And who's that?

李燕：那是谁？

Kate: That's my grandfather.

凯特：那是我(外)祖父。