getting sick of this

I thought he was doing so good this week but I got called into the pre-school office. when I get called into there it kind of reminds me of my school days. a mother has said that my son has punched her little girl and if he does it again she’s going to talk to me about it. like the staff have said they have not seen liam do this but they will talk to me about it. I don’t think the child even told the helpers so I don’t even no if its just the girl trying to suck up to mummy.