DNA evidence to support fiction from novels that people have tried to pass off as truth? Not sure what you mean. I don't have doubt that slaves, slave owner's, and their relatives had relationships, but I'm not so sure it was as widespread as most believe. Where is the proof of all these relationships? I've never seen the actual numbers, do they exist?
What evidence do you have that Jefferson didn't father Sally Hemmings children vs what scholars have shown? What evidence do you have to refute thst African- Americans don't have over 25% ancestory? Is it logical to concede that African-American slave women were eager to sleep with their masters?