@steven , as per your post:
- "How do you handle problem kids? We have about 4 homes in the park where the kids are always getting into trouble, fighting with one another and bullying."
I agree with @Rolf
- "Find a reason to boot at least one of the families."
I would start with evicting one family first.
If things do not get better, I would then evict family #2 and so on.
These families are not only causing conflict between the families...it is causing stress upon your good Tenants.
If you do not stop these fights, your good Tenants will leave.
We wish you the very best!