Pearl S. Buck is only 13 steps, and a 4th cousin 3 times removed! That's pretty cool, and even someone whose work I have read. I should probably re-read The Good Earth, as it has been decades.
Roger Sperry was another good find. Not so close, at 20 steps, but also a distant cousin. The fun thought is that I could easily have walked into his office when I was in college, and said "Hi, I'm your 10th cousin once removed."
Of course the problem with people that smart is that by the time you get the sentence out of your mouth they have already realized that 10th cousin means we share about 1 in 2^20 base pairs, or 1024^2, or less than 1 in a million.