so thats my point at what point do you say ok thats enough now we have to put a stop to this
Well how exactly would you do that, even if it was your place to do it?
It sounds to me as though she's getting a pretty raw deal, if your P has the children every weekend. Imagine never being able to have downtime at the weekend with your kids - it must be awful for her. I'm surprised she agreed it, and would be surprised if it continues, especially once your baby arrives. You might find you want to change the arrangements yourself.
Have you thought of what life might be like for you if things don't work out with your P and you had to hand over your baby every weekend for another woman to play happy families with?
I think your remark about the forgotten bookbag was quite revealing. Lost items, forgotten items, are actually really important. If he has them every weekend he needs to make sure they have everything they came with - simple as that.
and maybe just ignore her demands about the kids unless they are necessary, oh dont know
Well you can't ignore them - she will get to hear about it if you do, and you will provoke more trouble that way and it might well end up in court. They are her children, as well as his. Your partner can replace his wife, but you don't replace her as their mother and primary carer. Again, I would urge you to put yourself in her position.
I think the best advice you have had on here is to keep out of it as much as you possibly can, hard as it might seem.