My mil looks after my children 2 days a week while I work. I am very grateful for this
It has always been known that I don't smack my children. I was smacked as a child as was my husband. IMO it's hard to tell a child not to hit if that's how they are being disciplined.
My lb has told me this evening granny wasn't nice to him and hit him on the bottom with a wooden spoon. He said he didn't cry so I imagine it wasn't too hard.
Aibu to ask her not to smack them but to discipline in another way.