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In Spain it is not valid a verbal will if no ratified in the notaria.
So your mother has not a will at all
The house according to spanish law it is for the three doughters, and your sister has the right to get her part
You van manage a deal with her, and pay her an amount to get her part
In you do not get an agreement he could demand the judicial sell out of the propiety, so the judge could sell it out and you three get the money gotten
I will be here if needed
The best for you its to deal with your sisters and get an agreement