I get that you are emotionally battered. I know that I was too. I tried everything to make it work and up until I wasn't married, I was.
WAS's don't see it that way. they were done even before they told you. They seem to feel like we are holding them hostage somehow in a relationship that they no longer want. Remember though, they aren't looking at themselves and their issues, they are just wanting to feel better and well since they were with you and you couldn't make the pain go away, you must be part of the problem.
You have to remember that most of us here advising you have had a few good years of introspection. I was a mess when I was in it and all I can say is thank my lucky stars that I was able to get myself and my kids through it. I give my kids credit too and thankfully none of them blame themselves for their Dad's choices.
I hope before you do anything, ask yourself if you have tried everything within reason. You want to be able to hold your head up high knowing that you stood up for your marriage and have fought hard for it. It is important for you and your kids.
For what it is worth, I wouldn't budge on your parents possible future inheritance to you either. You don't have a clue what may happen to them in the future and besides it is their money. They may say you don't get anything if she is going to get x amount.
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory