Save Our Ancestral Home From Demolition

we are trying to save our house that was built in 1680. It’s been in my wife’s family for generations and now it’s about to be sold. Her father just passed away and we aren’t able to put the money down to save it. There is a 800k reversed mortgage on it and it needs a new roof. Jamie (who passed away) loved this pace. We all do. The next owners are probably going to level it and build a giant mansion and we don’t want that to happen! Help us preserve one of the oldest houses in MA