If that was the case I'd be emailing my parents all the time as my DD and dcg hug and fall on eachother all day long. LOL and sometimes they push if not happy.....it happens!

That will just cause the mom to have ill feeling againts the other child. and maybe even wonder why can't the provider deal with it? Unless there will be a bruise or there was blood I don't tell them. Kids are kids....the will touch. Its upto the provider to deal with it not the parents. IMO