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Are you saying that you are safe keeping the will for the parent?
If she has a lawyer than simply send the will to the lawyer. In the covering letter say that you were keeping this for safekeeping but no longer are going to be involved in her life and do not want the responsibility of keeping this will safe.
That should be all you need to do and you will be relieved of any responsibilities.
I am sorry to hear this.
You clearly don't need this additional aggravation and so it is a good idea to let someone else take over so you can heal in peace.