I've only read the first 2 pages so apologies if this has already been mentioned but I'm not liking some of the "Blame" that is creeping in here.
I am not estranged from my AC or DGD but I was from DD2 for a while, it's awful and hurt like hell.
We reconciled when she decided to end her marriage and when it all shook down we did have some things to talk about.
Biggest one was how stressful she found it with her dad being in Gulf War 1 and how he was different towards her after that. She felt abandoned by him - psychologically she was - and her boyfriend then husband found all the buttons to press (her words). She was understanding as a Child. Now she is willing to apply Adult understanding to her and our situation - we are very, very lucky. She still feels the abandonment but there is no 'blame"
Other factors (FACTS) it worth considering ...
1) any child is a combination of both parents so may be there is the possibility that the EAC"s thinking, feeling MH, behaviours etc are influenced by inherited traits as well as learned behaviour and childhood trauma?
After all we accept we as parents come with inherited as well as learned behaviour that affects our children. We can always be the parent our children want.
2) Straight Transactional Analysis but here's an other factor (Fact) for consideration ...
When we humans are in a difficult, traumatic, abusive situation we most probably we won't be in our "ADULT" (A) ego state or even are "PARENT" (P) ego state. The 2 grown up ego states with lots of information, strength and problem solving abilities etc.
So irrespective of how old we are, who we are responsible for, what we are required to "DO" in a painful, stressful, dangerous situation "We" are most likely in our "CHILD" (C) ego state.
Therefore, we can only do the best we can AT THAT TIME with what we have available to us.
This is not a cop out, it's a significant factor.
So saying we as parents are "responsible" (we are) for taking care of our children (we are) is one statement (I don't have a problem with).
However lashing out, blaming, shaming and being overly critical of ourselves and others for the parents we were is Not Helpful for Healing.
The people we are today are almost certainly wiser, less stressed, have fewer competing people and things to juggle than the Parents we were when our children were young.
With hindsight, reading, therapy, GN we can see, hear, learn "Where, How we might have been able to "DO" things differently in the HOPE of a better outcome.
We Did the best we could with what we had at the time.
I have NEVER had anyone say "I set out to do the worst job I could at bringing up my children".
So please stop Parent bashing.
Also getting into in a relationship with an abusive partner happens all too easily.
Being in that situation often leaves the outside looking grown-up working from the (C) ego state with only child like options available.
Anyone who gets out of an abusive relationship has already done a massive amount of hard, self work.
Never belittle that FACT.
What the children from that situation are left with varies but everyone is scared and will carry pain. Our children don't have a monopoly on damage, we may have been and still are damaged Children before we were parents.
Truly Adult Children who want to heal will work at accepting that reality. (I don't want to say FACT it's too inflexible and de-humanises us)
I agree that playing the "my pain V your pain game" isn't going to get people very far. However, I don't think it is constructive JUST to lay all the BLAME on EP.
Clearly EP being open to See, Hear, Understand the contribution they made to the estrangement Knowingly or Unknowingly and then be willing to addressing their contribution offers the best chance of reconciliation.
Not all EP are offered that chance even if they have done lots of work and have grown in many ways from the parent the AC cut off.
AC make choices. They may be made from pain. anger, resentment, MH issues or what they have decided is "Best for them".
Sometimes We Never got to fully understand the why's wherefores, the who's. The best we humans can do - is the best we can do and then show some respect for the journey another person is on.