Official Word has been handed down by our Council:
For a Webelos overnight campout each Scout needs a parent or parent approved adult (One on One rule applies). One adult cannot be responsible for two scouts even if they are not the leader.
As far as tents - They do not want two Dads and two sons sharing a tent. Scouts in one tent, adults (of the same sex) in another is fine. Each parent and scout could also share a tent.
Thanks for all of your help to clarify this issue. I know it's not Rocket Science, I just didn't want us to do anything wrong.