To sum it up, his mum seems to know best and has recently taken it upon herself to complain to him, when I'm not there, about the way in which I do things with my children. Rather than stick up for me, he's just agreeing and then giving me sh*t for it.
I'm not entirely sure how to approach the situation as of course I don't want there to be any fall outs, but half of me just wants to tell her she had the opportunity to parent her kids 30 years ago, leave us to parent ours 🤷♀️