1. the toys of the children: children'toys

6. the car of her neighbor: her neighbor's car

2. the instruments of the musicians: the musicians'instrument

7. the shoes of my cousin: my cousin'shoes

3. the barn of the horses: horses' barn

8. the bed of the dogs: dogs'bed

4. the mug of my coworker: my coworker's mug

9. the book of our teacher: our teacher's book

5. the house of our sister-in-law: our sister-in-law's house

10. the sister of Seamus: Seamus's sister