Просто определите где здесь possessive, а где нет.
Это ВСЁ, больше нечего не нужно.
1. Ken's (possessive) brother is in the car.
2. He's (нет) got a noisy dog. (нет)
3. She's (нет) my grandma.
4. The man's (possessive) car is red.
5. She's (нет) got the boy's (possessive) notebooks.
6. Ann's (нет) Tom's (possessive) best friend.
7. Helen's (possessive) mum is the girl's (possessive) aunt.