Legal Question in Real Estate Law in Texas

You can buy the house from your aunt's-daughter's-son (assuming that he is in fact the rightful heir of the house). Or you can buy the home at the tax auction.

Your aunt's-daughter's-son may also be able to give up his right to inherit the house. If he wished to do this you should consult with an attorney.

Good Luck!

Yes, we do cases like this all the time. You need to clear title from the aunt to the daughter (which may have been done already) and then from the daughter to the son. You then have the son transfer it to you. You will then pay the back taxes, and the land is yours. If everyone is cooperative, then you can accomplish this before the tax sale.