Siblings cannot be held liable personally for a debt they did not incur, in this case signing a Note. I presume none of you signed the Note or that changes the analysis of course. The mortgage company is ultimately entitled to proceeds from the property or possibly from the estate depending on what is done with payments to them. You probably need to seek the advice of local counsel if there's not already an attorney handling the estate. Under several scenarios there's something to lose or gain in how this is handled. For example, if there's a foreclosure there could be a resulting loss of equity or a larger claim against the estate.
Answered on Feb 12th, 2013 at 7:15 PM