What incredible wisdom, thank you. A few more details.
My one sibling lives across the country and has minimal contact with my parents. She has a mandatory call once a week (seriously - if she misses that call he will call repeatedly until she answers including threatening to call and embarrass her at work) and she visits once a year. Her last visit was in July - by the end of the 4 days, Dad was not speaking to her - I still don’t know why. That lasted a few weeks and then he resumed talking to her as if nothing had ever happened. There is no mechanism in my family for calmly discussing a disagreement or misunderstanding. So, long story short, she won’t be pitching in.
They have very few friends and are not on good terms with most family members.
I had no idea really that I grew up in an abusive home until I was an adult. I had no basis for comparison. Threats of violence, mocking and ridiculing, the silent treatment and constant threats to withhold college - I thought that was normal. My mother always made excuses - work stress, commuting stress, etc. I had no idea how to negotiate disagreements with a partner or that you could have an argument and then put it aside and eat dinner. All new to me. So the behavioral roles were set for decades and even though I now know how dysfunctional it is, I was cast as the good, obedient, respectful daughter and it is amazingly hard to break free.
I feel sorry for my parents in that they are missing out on the amazing relationships one can have with adult children. Our sons are 23 and 26 and we get along very well. I treat them as friends and we can discuss and agree to disagree on any topic. No yelling, no threats, just mutual respect.
I do think that once my father dies, I can have a somewhat better relationship with my mother. I alternate between hating her enabling behavior and the excuses she makes for him and feeling sorry for her as she takes more abuse from him than anyone else. But she can be very controlling in her own right when she is acting as his emissary.
The inheritance - out of my control. Hard to say I am willing to walk away from a very substantial amount after putting up with his crap for this long, but I do recognize I am paying a steep price.
So - now that I am armed with lots of great advice, techniques snd strategies, I guess I just wait and see what happens.