That depends where your grandpa was from. My paternal grandpa was a Brit, and I know where he and his mates bombed. He never let us forget. My maternal grandpa was Swedish. Sweden was a neutral country in WWII. At least once a year at a family gathering, the Brit grandpa would my accuse my Swede grandpa that the Swedes manufactured ball bearings for Hitler, and the fisticuffs would begin. Ah, memories from childhood.