OP,
I'm so sorry for you but I don't think in a million years you will ever be able to comprehend the full trauma and anxiety visited on your children at such a tender age.
Beyond comprehension really.
Wounds they will carry for the rest of their lives and will have impacted every area of their life.
I appreciate you wanting to get your house in order before you die, but the truth is, that is very self serving and about you wanting to die in peace.
I think asking your GP for some advice and support could be helpful and perhaps an intermediary from social services etc.
I would advise that you ask nothing of them, and expect nothing from them.
Perhaps writing them both heartfelt letters articulating your regrets and fully acknowledging the enormous pain your poor choices caused them would be a starting point to gather your thoughts and emotions.
Over time fine tuning these letters so that they could be of value to your daughters.
Could you approach the family member that supported your daughter?
The best legacy that you can hope for is that you fully acknowledge how hard their childhood must have been, and they know this.
How deeply you regret the pain and confusion they experienced.
How you take full responsibility for all the grief, sadness, loneliness and trauma they have endured because of their disrupted childhood.
I think if you do that, they may never forgive you, but they will have your words of real regret to read when you are gone.
Wishing you well.
