Estate Law Questions? Ask an Estate Lawyer.
Yes. You can force him. You would have to file a complaint or make a motion in court to do so. Generally, the action is a partition and sale action, whereby you request from the court to order the sale of the property. This would be if there were joint owners of the property. Additionally, if your brother is the executor of the estate and not distributing the assets, then this would be a breach of duty whereby you can ask the court to remove him and also order the sale. Depending on the procedural history of the case, the next steps could involve one or both of these actions. A telephone conversation or a meeting with an attorney would be clarify what directions to go.
It would be difficult to do yourself because it involves motion practice and service of papers as well as possibly a brief. However, you can always check with the court clerk to explain the situation and they may have papers that you can complete. Depending on the rates in your local area, most likely it could cost about $5,000 or more as the case continues in local attorneys fees to bring an action in court. However, an attorney may be able to negotiate something prior to bringing an action if your oldest brother realizes its better to settle this.