My family do not fraternise with nig nogs. No great great ... add as many as you like ... grandmother of mine
Actually, all of humanity is descended from black people. It was an evolutionary adaptation to enable our furless bodies to survive in the harsh African sun. Without it, our ancestors would all have died of skin cancer millennia before we invented agriculture.
Yes, that has been an interesting political rewrite of history ... Assuming that black people turn into white people. It totally ignores that both would have evolved since from a common ancestor, it ignores Neanderthal genetics being added to the white genome and suggests black people remained the same and white people changed but we are all the same really. This is like saying birds and lizards are the same. They both evolved from lizards. That doesn't mean birds have been having sex with lizards and that birds are basically lizards.
My great great great .... great grandmother may well have had sex with a common ancestor, but she didn't have sex with a black man.