This is not a matter that you can handle without an attorney. You need to get an attorney quickly, or write off your chances of getting anything.
It seems to me that is is possibly misfeasance of the executrix to allow the home to go to foreclosure. It should have been sold out of the estate by a forcible action against the heirs. Now, the executrix has allowed bickering amongst the heirs to cost the estate a great deal of money. What a shame.
It is very rare rare to see to see equity come back to the owners in a foreclosure. It does happen, but rarely. Good luck.
This answer is not intended to create an attorney-client relationship and may not be relied upon as legal advice. A careful examination of the facts is necessary before a legal answer may be relied on. You should consult your own attorney before taking or refraining from any legal action.
The personal representative is pehaps committing waste of an estate asset by not addressing the foreclosure issue. The Estate could have entered into a short sale, and perhaps salvaged some of the equity in the home. Instead now, foreclosure costs, fees, and interest, will diminish most of the equity. Seek an attorney's advice ASAP.
Please note that THESE COMMENTS ARE NOT INTENDED AS LEGAL ADVICE and are for informational purposes only. This response is not intended to create any attorney-client relationship and is only based on the limited facts given. The response might change should additional facts be learned and should not be relied on as legal advice. It is recommended that you consult with an attorney who can properly assess the situation, as well as all pertinent facts, prior to taking any action based on the foregoing statements.
You need an attorney who will file a contest of the lien. There is no way to predict how much of the equity will be eaten up by the foreclosure action, however no matter what, foreclosure properties sell for less than the same property sold in the normal market and not a foreclosure or short sale, so the odds of any equity remaining are further decreased.
More importantly, why allow this to go on. If there is a personal representative, she has a duty not to allow estate assets to drift off into chaos and to be depleted or extinguished. See an attorney.
Please note that the above is not intended as legal advice, it is for educational purposes only. No attorney-client relationship is created or is intended to be created hereby. You should contact a local attorney to discuss and to obtain legal advice.