Real Estate Legal Advice?

Do you have an executed doent stating that you are the official broker on record for this specific property purchase (such as a buyer representation agreement)? Or at least a section in the LOI, stating the brokers involved in the transaction? If you have one, and it is dated prior to a similar doent that the other broker may produce, then you are entitled to the commission. If you don't have a signed agreement, you may be out of luck.