It sounds like your brother owed you money. Your brother sold the home, and paid you what he owed you (although perhaps by legal force instead of voluntarily).
In that case, the sale of the home has nothing to do with you, and the repayment of the debt is only taxable if it is more than he borrowed (if you loan money, interest you receive is taxable but repayment of the principal is not). However, we don't know all the facts, and I might have made some incorrect assumptions.
Also, if you did loan money to your brother, you might be required to report and pay taxes on interest that you should have received, even if you didn't charge interest. This is called "imputed interest" and is a bit complicated. I'm not sure if we need to go down that rabbit hole or not.
