I don't know of any really significant ones, but I can say that one of my still-surviving ancestors - my grandmother - worked in a factory bolting Spitfires and troop-carrier gliders together during WW2 (amongst plenty of other pretty hardcore stories she can tell of her youth), and my grandad was a union leader who helped get immigrant workers in his factory on an equal footing.
I doubt anything I'll ever do will match up that kind of epic behaviour.
Oh and there's a castle in Wales that bears my family name, but apparently we have no claim to it as it's probably just a case of convergent surname evolution, never mind that it's such a goddamn rare one I know of about FIVE PEOPLE IN THE WHOLE WORLD with it outside of my family. So there's a chance that someone deep in my ancestry built an ACTUAL GODDAMN CASTLE (none of this Minecraft bullshit

)... or maybe they didn't.
Meh, I'm happy to say "at least one of them had a hand in us winning the war, and another was a very minor civil rights campaigner".
Oh and that's not forgetting the great grandfather who was one of the many millions on the "good" side of the trenches in WW1...