@Outsidermum
It does make me sad that DH relationship with his family will be seriously affected by all this but it isn’t my fault. My own DM always told me to go still and ignore them. But I just can’t anymore.
I think it will be the opposite. They will be delighted to have erased you from the family and have your DH all to themselves.
It’s up to your DH though if he is happy to support that situation.
I agree with PP. Your DH needs the long list of 20 years of emotional abuse so that he can shake himself out of his comfort zone and denial and see the consolidation and patterns of their behaviour over 20 years.
He also needs to be told that zero info about you is given so that they can’t still feast on it and bully you in your absence. And the same goes the other way - you don’t want to hear anything about what goes on or what was said when he is with them - because this will get in your head.
It is my experience that once you have removed yourself from being this family’s scapegoat - another person will have to play that role. Sit back with the popcorn and watch that happen.
However this is likely to be one of your DCs and/or they will be pumped for info about you. Would recommend distancing them from this vile family.
Your DM is wrong - never suck it up and be polite - this is evidenced by the 20 years of shit you have endured. Break the cycle teach your DCs what toxic looks like and give them the permission and skills to detach and move away from people the instant they detect it without any FOG (fear, obligation, guilt).
I hope you feel empowered knowing what’s going on and deciding to value your self worth by dropping the rope. Expect them to notice and try to hoover you back in - just so that you are close enough within punching distance and they can start all over again.
Don’t get drawn into any of their nonsense traps.