Use nouns in the possessive case instead of the prepositional phrases:
4.The name of their son
5. The profession of her husband
6. The family of my uncle
7. The friends of our father
8. The room of their children
9. The grandfather of my sister-in-law
10. The name of my cat
4. Their son's name
5. Her husband's profession
6. My uncle's family
7. Our father's friends
8. Their children's room
9. My sister-in-law's grandfather
10. My cat's name