I want the birthday child's family to register for the birthday party event but I also want the kids attending the party to have to register so I can capture their agreements to our policies...is this possible?

Using the Events Online module you can set up your birthday party events in such a way that your family reserves the spot for the birthday party date/time and the kids attending the party will register for that particular party. This allows you to have the family answer questions about the party itself while also capturing the attendees' agreements to your legalese and their contact information.

See our Best Practice article Capturing Birthday Party RSVPs using Events for full instructions.