AmberGran
Sounds like your children are still young. When they grow up a bit and have children of their own and realise a bit of what you went through they may have different ideas. He is probably in the 'unknown and exotic' category at the moment. You can't expect young children to remember things as you do, even if they were upset and hurt by what he did. But when they have a bit more life experience they be better able to understand.
Please don't make them play piggy in the middle. No matter how hard it is just tell them 'I love you very much. I have always been there for you and I always will. You're old enough now to make your own decisions.' Of course you may have to be there for the fall-out at some point.
No, Dazy does NOT have to "be there to take the fall out ".
She's already been there, done that, got the emotional scars.
Taking the shit /picking up the pieces is what she did for decades, bringing them up from early childhood , singlehanded.
They are not helpless children now ; they are adults ; old enough to know the score, making their own choices. Bad choices; selfish thoughtless choices at the expense of Dazy. Just like their father did. She didn't deserve it 20 years ago and she doesn't deserve it now.
Now they are grown adults they have to take responsibility for their own decisions. If they get hurt; too bad. Their choice, but they have to bear the consequences of it.
Dazy has a choice now , that she didn't have before.
This time, she does not have to pick up the pieces or clean up the mess all over again.