Definitely BU as I don't have any kids, but my MIL constantly refers to my younger nephew (almost 2) as the naughty one compared to his older brother (3 1/2). She says (in a baby voice) "who's naughty, yes you are" and gets him to say he's naughty but all in a jokey way. She also makes light of it when he does 'naughty' things, i.e. the other day SIL left him watching TV and was distracted on the phone, he left out the back door and was half way down the metal back steps! MIL then was saying things like 'oooh that's very naughty, yes you're a very naughty insertname' again in a baby voice making him giggle, whilst I don't think she should scream and shout at him, he just wanted to go outside and obviously doesn't understand but I feel talking to him like this means he gets a positive response for doing bad things, and consistently telling him he's naughty will just make him think he is and therefore do bad things. SIL doesn't seem to mind but doesn't do it herself but MIL does look after a lot. I want to have DC soon and I will hate it if she does this to mine.
Anyone had similar problems/whats your opinions,