I had a 5 year old girl, my first daycare family, bully my daugther who was then 2.5. Not really physically, but she was mean to her, corraling all the other kids not to play with her, aggravating and egging her on so she'd get into trouble, pretending she was going to hit her to scare her.... after about a week my daughter wouldnt play with any of the kids. After a week and a half, I let them go. I told the parents, Mom said she couldnt belive it, she's an angel, Dad said yes, they've been having trouble with her and other neighbourhood kids. They left and refused to pay me.