I am sorry that you were abused. That is horrible. What an awful childhood you had. I'm so sorry.
I had thought about this for a while before I decided to post anything, mostly because I have such a good relationship with my Mom (sans defiant teen years) but overall we have a great life.
So to help you I had to draw on the relationship I had with my x-mother in law. Controlling, manipulative, degrading, argumentative, and a liar. Those were her good points. When I left my marriage, she made it clear that I didn't leave 'her'.
In my head it would be a tossup as to whom is more evil her or her son (my x) Both were manipulative and both were/are very, very ill. Self medicating, woe is me, feel sorry for me type people. Loathesome.
When I left my torturous and abusive marriage, my son was just devestated (and went overboard) about Gramma. I would find out later that she had abused and tortured my son. The behavior of needing gramma was typical for a child that had been abused. Counseling showed my son that it wasn't right that Gramma was so mean and abusive.
WE hid from them for years and a glitch by a phone company gave her our address. When she showed up I panicked. All those controlling feelings came over me, and my life was just starting to feel safe. Df said I had to face her, and she demanded to see her grandson. My son really wanted nothing to do with her, but even at his age 12 told me the RULES that grama had to follow to talk to him. She blew it in the first minute and my 12 year old son got up and left the table with her catterwalling, crying WHAT DID I DO? THIS IS YOUR FAULT.
The last time she came to visit unwanted and unannounced, she actually managed to engage me in a scream fest, which DF broke up saying "NOT AT OUR HOME." She backed down, I saw difficult child hiding in the woods on his bike to avoid her and I finally told her that my son had admitted to the therapist that she had abused him and x had molested him and sold him for drugs.
After that (calling her on the carpet) I was innundated with phone calls, emails, letters to the point I typed out a legal leave me alone letter and sent it registered mail to her, and my x, with copies to the therapist, caseworker, and sheriff's dept.
She died a while back and I thought I would feel remorse or sadness at her passing. I didn't. It was like nothing. I sat my son down and told him too. I said "Honey your Grama died Tuesday." and he looked at me as if there were more to be said and then said "Can I go ride my bike?" Nothing there either.
Sometimes the smart money is on keeping to what is working for you and what has helped work in the past. I feel through your writing you're more aggitated she's even trying because your brain knows what the outcome will be. Even if you aren't psychic, history tends to repeat itself.
I'm sorry that you can't find your brother. That must be difficult too. My advice would be to tell her that you've lived your past, mended what she did, and would prefer that she not be in your future. VERY IMPORTANT: NONE of what was done to you, your dad, your siblings was YOUR fault. You were a victim and by the sound of things are an overcomer. Tell her if she's changed then good for her, she needed to change and you hope she doesn't continue to further hurt others or herself with her behavior, but enough time hasn't or will not ever pass to allow a relationship. Tell her these are your wishes, she should respect them.
Don't be petty or vindictive. She's a sick person. Doesn't mean you have to feel sorry for her. It just means that you've done very well for yourself to overcome her abuse and move on in your life - a life which she may not be a part of.
This is really heart wrenching - I am so sorry for you.
Hugs & Love
Star