DS has recently made friends with a boy who has an older brother with a disability. DS is 3 and has been invited to play at his friends house, he is at the age where he is likely to say something inappropriate ie. recently asked a mum at school why she was fat! So I want to simply explain that he friends brother has a disability, but I'm not sure about the right was to go about it so that he a. understands and b. doesn't say anything inappropraiate. I hope that exposure to the family will mean that ds will grow up respecting and understanding this boy, but am just concerned that while ds is so young he might say something upsetting. Unfortunately I don't know the mother too well yet, so I'm not sure how she might react.