1. Their children's toys.
2. My son's questions.
3. My brother's wife.
4. Our teacher's table.
5. The animals' life.
6. This girl's voice.
7. The pupils' new book.
8. The Peter's letter.
9. My parents' car.
10. My friend's room.
11. These women's handbags.
12. My sister's last flat is large.
13. My brother's children are at home.
14. The boys' room is large.