Your Brother is ignorant. Of the roughly 50 members of what were known as the “Dixiecrats” exactly three became Republicans. Jesse Helms, Strom Thurmond and a legislator from Louisiana whose name escapes me. The rest stayed Democrats until the day they died like Robert Byrd.
It's virtually impossible to get through to younger people about how badly they have been miseducated - I fear two whole generations are going to have to find out the hard way.