In the year 1945, my great-great grandfather, serving in the army, wondered when he'd get to go home to his wife and the son he'd never seen. He got his wish when the US ended World War II by dropping atomic bombs on Hiroshima and Nagasaki.”— Nate
Nate's great-great-grandfather was a soldier in the US Army that served in 1945, fighting in World War II. When he went to war, he left his pregnant wife back in the United States, who gave birth to his son while he was away. Following the atomic bombing of Hiroshima and Nagasaki, the war ended and he was able to reunite with his wife and meet his son for the first time.
Nate's great-great-grandfather is only mentioned in Fallout 4.