D.M.
Hey, try talking to the boy without your daughter around and tell him that she really likes him and likes playing with him but would he please please take care of her for you!!! Tell him that she is so little and needs to be watched out for and that it makes him such a really big boy to do that for you and not to tell anyone that he is protecting her but don't let any of the bigger kids pick on her or hurt her...he should enjoy this alot and really want to take care of her, worked for me..