If it was me, I would tell the parents that their son is having a hard time playing an interacting with the other children, and suggest to get his hair cut. Joke about how others ask how the little girl is......
If they don't react the way you want them to - like getting the kids hair cut, I would put elastics in his hair so he could see and play. Then see what the parents do when they pick up their son! lol
I was going to suggest you do the exact same thing lol !
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