1. Kate is his distant relative. - Kate is a distant relative of his.
2. Her uncle is in the Far East now. - An uncle of hers is in the Far East now.
3. Let me introduce my cousin to you. - Let me introduce a cousin of mine to you.
4. Their great friend is a doctor. - A great friend of theirs is a doctor.
5. Our grandson is a first-year student at the University. - A grandson of ours is a first-year student at the University.
6. Is Helen your niece? - Is Helen a niece of yours?
7. It is my habit to get up early. - It's a habit of mine to get up early.
8. It is his favourite expression. - It is a favourite expression of his.
9. He is our colleague. - He is a colleague of ours.
10. It is her idea. - It is an idea of hers.