Both my MIL and DM both do this. If I have a rule or a way of doing things, it immediately has to be compared to my SIL's. This morning it was a comment about how I don't like the TV on when the children are eating. I said it because my DM switches it on at mealtimes in her house and I wanted to pre-empt her doing it here (she's staying). Straight away she starts going on about my SIL having it on in her house over breakfast for XYZ reasons. I don't really care tbh. Nobody needs to justify what they do in their own house with their own child. That is their own business.
I NEVER criticise my SIL's, I think they are excellent mothers (if my opinion even matters!). However, every move I make seems to have to be counteracted with what they do and I'm sick of it. I've tried saying 'oh that's nice' or similar, but it just goes on and on.
Any advice to get them to stop?