A friend has three kids and the eldest (5) is at an age where he's testing boundaries. Thing is, his parents don't seem to be getting a chance to discipline as MIL does it for them! Noticed this at a family meal for her birthday recently. Telling him off when she perceives him to be misbehaving (he wasn't, IMO) while his parents are sat right there. The kid looked visibly upset and my friend didn't seem to notice. I find this pretty odd and a bit toxic. Is this normal for grandparents??