Disagree.
If you go back far enough, it is almost certain he (and you and I) are descended from both slaves and slaveowners.
He would have to go back allot farther than the Jews, the BlACKS IN America BEFORE 1865, OR even most European who escaped the slavery of serfdom that was the norm in Europe for the majority of human history.
Progressives are such wonderful people. They condemn slavery. (Who does not?) However, according to progressive ideology, slavery is a perfectly legitimate institution in some circumstances. Check out the Morgenthau Plan and the Yalta Agreement, both of which provide for “enforced labor.”