My DS is 4 and he is going on a playdate at another boy's house. He is fine doing this sort of thing, done it before and I generally do leave him for an hour or 2. The boy's family are Spanish and parents are learning English at the moment. The little boy has great english, but I doubt at 4yo he can translate for them what I want to say...
I want to say/write, just so that they know in case DS gets funny whilst he is there...
"DS has mild autism" or Aspergers syndrome
I could write it on a note and hand it to them?