I have a little niece and she is just over a year old. I watch her a few times a week. The problem is her older sister. She can be a little heavy handed at times. I get nervous when she even goes near her sometimes. I don't think she would ever do something to hurt her on purpose, but she is a baby thinks can happen.This has been on my mind for a while and I can't shake tithe bad feeling I have. Should I talk to their mother about this?