Can you help some take there kids to car and come back if your ready to leave

Yes

Yes, there is the option when you go to guest services right before you enter the park

Yes, you can just talk to someone at the front to let them know that you're coming back in and it's not a problem to go out and come back in.

No problem talk to gate keepers first on way out.

Yes you just need to get stamped fir re-entry.

Of course