Ancestry/Genealogy

it's linked to your memories of those who have died, and happy memories of childhood, and the long family history. It's going to be very hard to lose it.

Is there a chance the family-- your brother, your cousins-- can make your mom an offer? She might well accept much less if she knows someone in the family will be taking care of it. How is she fixed financially?

Consider her viewpoint. She probably wants to get out from under the work of taking care of the house and land, and also she probably wants some money to be secure. You might be able to persuade her to sell to family, or lease it back to you, so that she has an income or some capital, and someone else will take care of the house.

You might talk to her about this. A long time ago, my parents sold a house that wasn't anything special, but it was home for me. They did it because they needed the money. IF they would have told me and my brothers, we might have managed to buy them out... but they were ashamed and so did it quickly.
Talk to your mother-- lovingly-- she might be willing to discuss some options. What does she want out of this, what would make her happy? It might not have to be a million dollars.