Did your Opa survive Buchenwald? I assume you may not have existed had he not, but age matters and that may not be true as so little time has passed since we have known of the camp. Barely more than seventy years. In addition Buchenwald had a rather interesting post WWII history being located in the zone occupied by the Russians.
He did survive, he did get out. And I got to grow up with my Opa. However, if he had died in the camp (as a lot of our relatives did of course), I might have still existed, because my dad was 7 and they got him out of the country to England on the Kindertransport train. He was raised from then through high school by English foster parents. One of the luckiest of families because only 10% of the kids on that Transport ever saw their parents again. Amazing stories I grew up with and I take nothing for granted.