Your mother's response to this is downright CRUEL. I have NO idea how old you were when this happened, but it it concerning that you had one actual suicide attempt. Again...it is my true hope that you reach out in whatever way you can to a professional, be it in person or via the web.
Are your siblings over 18? Why is all communication routed through your mother?
Your mom needs an attorney to probate your Father's Estate. Saying she can't "figure out the paperwork" is just another way to manipulate you. BELIEVE ME, she WILL find a way to stay in the house. Everything that your dad had goes to her. (You mentioned the house, retirement accounts, etc.) She does NOT sound like the kind of woman who can't "fend for herself". Again...I would NOT GO,
This is also heartbreaking. WHY would you put yourself in just mental anguish to help people who certainly do NOT care for your feelings?
I think I mentioned earlier that, sadly, I lost my Mom last year. It's just AWFUL pain, and ANGER is part of the grieving process.
Be gentle with yourself. You need to allow yourself the time and space to properly grieve the loss of your beloved Dad...
I would stay away from your Mom.
As always, my best...