She should not be telling the kids you will continue to be at her family functions. Part of it is trying to soothe the kids and give them some type of assurance that things will not be that different after the D. She doesn't want to appear to be the bad guy with them.
The other reason could be what a lot of WAW's have, which is an unrealistic view that life will continue without too much interruption......in other words, she wants to eat cake.
By no means should you even consider taking part of her family events. You do need to part ways and move on. Besides, once she has another man standing by her side at her family events, I'm sure you would not feel very welcomed.
I have been keeping up with your thread, just haven't said much. I think you give good advice to newcomers. Keep up the good job.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!