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I am sorry to hear about this. In such situations, the owners can file for what is known as a partition. This asks the Court to force the issue, deciding what to do if some owners want to sell, but others do not. Then the Court will order a sale and payment based on interest in the property to each owner, or for one owner to be bought out, etc - it depends on the situation.
In this kind of situation where there is only one stand out, the Court normally orders the property sold if the majority want it sold, and the standout would still receive their share, of course.
However, until/unless the standout agrees, or the Court allows it to be sold via a partition suit, the sale cannot proceed.
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