Those are odd sentences for a 3 year old, but sometimes children hear things from their parents and repeat them in an incorrect manner and they don't make much sense to us. But if I were you I would tell the parents exactly what he said and ask them if there is something you should know about. No use letting it make you crazy, just ask and get a straight answer from the parents. I hope he just had some weird thoughts in his mind that don't make any sense.