If you have 2 passes and the vehicle pass you should be all able to camp there. You need passes for kids over 12, otherwise 1 child per paid adult is my understanding of the deal. I have been coming to the festival for a while with kids and there is no separate camping pass for them. There is nice camping along the trees by the river if you can get it (its first to go) otherwise you can camp on the ball fields with no shade (bring an ez up for shade). You will not be able to camp next to your car I don't think, but it will be close.
Listening to:
the wind