You need to get professional help for yourself and for your mom.

Your mother is using "suicide" as a means of controling you OR she is severely depressed: either way professional intervention is a must.

I also think you ought to consult an attorney about the house and your (and your siblings') legal rights and responsibilities. If your siblings are not willing to help, you need to be sure they can't "hurt" you or your mom, either.

I'm sorry you have to go through all this. Please find (or CREATE) a network of support for yourself...soon!

Blessings,
Lenora