There is a KOA about 30 miles west of Philly. Its a QUIET campground ON the Brandywine River. There is a "Wing" that could be rented for all the "E's". It has a pool, allows dogs, 20 miles to Amish land, close to Philly(Liberty Bell etc) ,Many Battlefields and museums. They rent canoes (canoe from your camp site) and is located in Chester county horse land (hence lots of mushrooms).

This is not as big as Harpers Ferry-no golf carts needed! If peeps are interested I'll see about a group discount. The address is Coatsville but look on a map West of West Chester, PA in the little hamlet of Embreville.
Best, MoonDrop