If the parents Don't jump Do they have to pay to get in like the kids

Only if you are jumping too. Like with a small child. I go with my grandchildren who jump on their own and only pay for them.

If your child is small you have to pay for yourself to jump with them and they're free. My kid is 2 and he's free but i have to pay.

No you only need to pay for your kid or kids than you can just watch them

Yes