Can a contract be voided if a personal representative "self deals"?

Question Details: My brother was named personal representative for my mother's estate. The court ordered the house to be sold to the first person who had the full amount. My brother "sold" the house to the first person who flashed $4,000 in front of him claimed it was down payment and accepted rent-to-own monthly payments over a 4 year period. He spent the $4,000 gambling which he admitted in court to the judge. He also signed the contract just using his name, not his name, personal representative for the estate of, my mother's name.

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