This is such a common scenario isn't it esp if you read the stepparenting boards and one that is played out in my own life quite frequently.
( I am the loon/slack exw btw )
Exw is constantly criticised as being a crap parent by exh and his new p or w joins in - because you would have to rationalise his point of view if you were with them and have also fallen victim to his controlling ways.
IMO and in my own situation its because my exh is a control freak who is paranoid about weight and appearance and has met a likeminded woman.
I had a similar thing yesterday met exh and he was moaning about ds2 weight (he is 8) - I suspect they weight him. They have certainly made comments to him and he is put on a 'regime' when he is with them. Certain foods are demonised and he is questioned on what he has eaten when with me. I've trained him to say 'organic bean stew' LOL
I simply do not agree with dieting and think this approach will give him issues if he hasn't already.
he says that not being thin is the worst possible thing that could happen to a child. Or if they are not wearing Boden (well not quite that bad but comments are made if they are in leisurewear)
DS1 incidentally is skinny as a rake.
Bet she thinks that you and dh are a smug and controlling right pair, Bonsoir.