I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
Absent cooperation from all owners of the property in the sale of the property, you are left with only one option and that is that you, with or without your other brother, file a Partition lawsuit against the brother in possession. Here is a link to a brief discussion of the Partition law in Virginia: http://www.partitionaction.com/states/virginia/
The action for Partition specifically is used when one or more owners of a property want to sell the property, while other owners do not. All owners must be named in the suit either as plaintiffs or defendants.
The court will order that the property be sold and the equity remaining after sale divided according to the percentage ownership of each owner.
Alternatively, the court will allow one or more of the owners to buy the ones out that want to sell---but that will only work here if your youngest brother has the ability to buy you out and keep the property for himself.
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I wish you and yours the best in 2015,