You need to get yourself to an estate planning attorney ASAP.
You may have been left some (or all) of the equity in the house. If so, you may be at risk of losing it.
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Although your question is in a way related to debt collection, I agree that you should contact a local attorney who handles probate / wills etc.
My answer is for only informational purposes and is not legal advice. I am licensed to practice law in Oregon and I recommend contacting a local attorney for the best help with your legal questions.
I am confused with the information you include. The fact that you received the notice means somehow that you might be on the deed or otherwise have some ownership responsibility. Was the second of your parents estates probated?
If so, the loan that was taken by your brother while he held the POA should have been addressed. If no probate has been done, you need to look at how the house is titled. You need to speak with an attorney who does probate work. He will look at the passing of both your parents and if your brother acted appropriately under the POA. Don't waste anymore time as you could risk losing the house.
When a person dies, all of their property should be gathered up and distributed, as they wish, or as the law allows, among their people. You did not do this, and you probably feel uneasy about that.
Although, if you did not sign the note, you are not personally liable, you and your siblings do have a responsibility to wind up your parents' affairs. A good way to start would be to visit a probate attorney and tell the whole story. A good counseling attorney will help you to sort out what needs to be done and by whom. Don't panic, but don't postpone this. When all is said and done, you will be better off if you do it, and sooner will be better. I recommend that you call an attorney and make an appointment tomorrow.
It sounds like the financial institution is petitioning to become administrator of the estate of the second - to - die parent.
If your parents owned the house jointly, the surviving parent would have owned the property at death, and something must be done to establish who owns it now.
Massachusetts Probate Law says that a creditor can petition to administer an estate if no one in the family steps up:
Paragraph THIRD might be what the bank attorney is using to file his petition.
The question for survivors like you is: "How much equity is left in the house?" If your brother stopped paying the mortgage, he probably stopped paying the town property taxes and home maintenance, too.
If there's something left after those costs are taken care of by the equity (over and above mortgage principal and interest), you may have an interest worth pursuing. But you don't know until you investigate.
John L. Roberts
Estate Settlement, Probate, Estate Planning, Elder Law and Disability Law
PS: The Massachusetts Probate Code sets up a new system on April 1, 2012, and the statute linked here is repealed effective on that date.