Help! Rewrite the following sentences in the possessive case.Example: The house

Help! Rewrite the following sentences in the possessive case.
Example: The house of my parents is large. - My parent's house is large.
1. The friends of her sisters are very nice.
2. Do you like bedroom of the children?
3. That girl is the daughter of the Whites.
4. The room of his cousins is next to mine.
5. Where are the cars of the policemen?
6. The garden of the Simpsons is very big.
7. The park of St. James is beautiful.