My brother's SSI has been cut off because they found out he purchased an investment property 6 years ago. In 2007 he transferred that property into the trust and it is in the trust until today. The property is upsite down and in foreclosure. We got a letter from SSI stating that we need to repay everything he received since 2009, it means the amount of $9.665.00. Because my brother in mentally disabled, SSI wants me to repay that money. What to do?