when I was an adolescent my mom had a friend named barb, who had a farm near bethlehem, PA. barb would often invite us over to hang out at the farm, or camp or whatever.
One weekend when we stayed at the farm all weekend, I was out hanging out with barbs daughter, who was around my age but pretty manly and ugly so I never thought of doing anything sexual with her, though she didn't like me either in that way apparently...I can't even remember the daughters name. The daughter introduced me to some strange acquaintences from down the road. There was another girl, who I can't remember at all, but I have the dim impression that she had the same deformity as grady stiles, exact same deformity. There was a male, too, a year younger than me, with the crab hands as well.
All I really remember is that we all spent most of the day together in the woods and at the farm, it was very surreal, and that the crab hands male preteen was one of the most vulgar and loathsome persons I had ever met. He had crab feet too, and he would make a big show out of stepping on piles of cow shit and moaning in a sexual fashion as the manure squeezed around the toe pinchers. He would also dry-hump trees at random times. I can't even remember much else about that day.
A few years ago I happened to see a short piece on some cable channel about the murder of grady stiles, and it had interviews with his children. There was a male being interviewed that was just about my age, and he had the same deformities. The show talked about how rare that particular form of polydactyly (sp?) was....IDK....no hard facts on any of this stuff, just my memories
edit - I forgot to add that the show also talked about how the stiles family was native to and lived in northwest PA