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I'm sorry to hear about your situation. A quitclaim deem does not mean that you'll be responsible for any of the debt. You don't have any obligation to sign the quitclaim deed, but ultimately you may or may not. Basically IF you sign a quitclaim deed, you're saying that IF you have any interest in the property at all (by virtue of being heirs to her estate) you're giving it up to them. You're not saying that you actually do have an ownership interest, but to the extent that you do, if you do, you're giving it up to the bank.
If you don't sign this, they would need to do what's known as an "in rem" legal action. "In rem" means pertaining solely to the property. Essentially it's where they bring a lawsuit against any potential owner of the property or anyone that might have an ownership interest by virtue of being legal heirs. Again, they're not seeking that you would be responsible for any of the debt. The maximum that you could be responsible for would be your interest, if any, in the property itself.
In short, I don't see any issues with you signing the quitclaim deed, as it keeps your name off of public records in a lawsuit. But you also have no obligation to sign it, and IF you don't sign it, you're not going to be any more or less liable for any of her debts.
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable. Please note that I don't get any credit for the time and effort that I spent on this answer unless and until you rate it positively (3 or more stars). Thank you, ***** ***** luck to you!