Has/have:
1. Sandy caught a lot of fish.
2. Jim and his father made fish soup.
3. they ever eaten this kind of fish?
4. Mother made a cake.
5. My family had a nice time.

1.has

2.have

3.Have

4.has

5.have

1. Has , т.к. 3-е лицо
2. Have, т.к. множественное число
3. Have , т.к. множественное число
4. Has, т.к. 3-е лицо
5. Have , т.к. множественное число