OP,
Teasing it out here is giving you clarity.
Again, I mean this kindly, but I doubt she loves or cares for you at all.
She happily did EXACTLY what suited her for 40 years.
What she needs now is a carer.
Someone to use in her old age.
That is what she is focused on.
Do you intend to allow her to use you and your family for the next 20 years?
That is the core issue here.
Are you going to allow her to be the poison in your life for the next 20 years?
A benevolent presence your whole life.
You have agency over your life.
You didn't as a child when she couldn't give a shit about you.
I'm with @LactoseTheIntolerant, grey rock takes energy and time that is only a plaster on the problem.
Fxxk that and the stamina that is required to police and maintain it.
NC is the way to go, with your husbands support.
No contact and police involvement if she comes near your home.
Of course it will be difficult initially, tough decisions usually are.
But the payback is simply enormous.
So many posters that were brave enough to do it describe the ensuing years as " blissful peace".
This peace could be yours and your family's.
Do it for the child you were, who had no one in her corner.
Do it for your children who deserve a mother that is at peace.
Do it for your husband who loves you and deserves to see the woman he loves calm and peaceful.
You had such a very hard and miserable life.
You are amazing to have built your own loving successful family unit.
You deserve the rest of your life to be peaceful.
Keep posting if it helps.
We are here for you.
