Are they alive? I suppose they expect you to help him too. Point at them and laugh.
Tell them calling them by their first names "John Jane I've changed my last name. If you need help, call your favorite son. You are both dead to me.". Cut them out of your life.
Actually they sound like the type to let a lawyer tell you.
It's not your brother's fault, but I wouldn't lift a finger to help him unless he paid me...a lot.
After he used us like slave labor, forced us to build his hillbilly c*nt a house, mentally abused us, lied constantly about our inheritence the male that claimed to be our father let his new wife, talked him into changing his will, cutting my brothers and I out completely. 18 years of abuse and beatings
Unfortunately he had a quick death and the worthless c*nt remarried a few months later. I hope he's roasting in hell.