Решение:
Добавляем 's для образования притяжательного падежа:
- My mum's car is red.
- Our cousin's house is in the city.
- Is this your granddad's piano?
- What's your dad's name?
- My best friend's birthday is in October.
- His sister's dance classes are on Monday.
- Is our dog's nose brown?
- Where is my brother's T-shirt?
Ответ: 's, 's, 's, 's, 's, 's, 's, 's.