We have seen many French families enjoying Club O with their young children on the beach there over the years. I am sure others will chime in here. You will be welcomed with them.

A closer nudist resort to you that is also definitely children friendly is Avalon Resort in Northeastern West Virginia in Hampshire County, just a little south of PawPaw. We don't know where in central PA you are, but Avalon is about one hour from the Breezewood exit on the Pennsylvania Turnpike and 45 minutes from Berkley Springs WV.