I have a family of 8 6 kids myself and wife are TT sleeps 9 comfortably but I noticed allot of the camp grounds state 6 max per site what do large family's do ?
I imagine it would be a reason to ask you to leave if the situation got desperate. Otherwise I would ignore it since I am sure your kids are all perfectly well behaved.
Reminds me of staying in Motel 6 many times as a kid on vacation. Family of 5 and 4 person maximum. One of the kids always had to duck down as we passed the office. ;)