When co-owners of property (either real or personal) cannot agree as to ownership matters, there is a legal remedy that can be employed. It is called "partition". In a partion action, if the property in question can be divided the court will so instruct. However, in the case of where divsion is impractical (such as in your case), then the court can order a "sale in lieu of partition". In such a situation, the property will be sold at fair market value and the proceeds will be equitably divided. That having been said, before it is put on the market, any owner who wishes to keep the property has the option of buying out the other owners