SPOILER ALERT!!!===================
It's easy to understand why the last mission for the railroad/bos named the Nuclear Option. They are resorting to explode the Institute by igniting the reactor. But, why should returning to see a dying son named the "Nuclear Family"? Why not just "The Reunion"? Does it have anything to do with the nuclear? Or Bethesta is just hoping the last quest can be named following kinda of pattern?
Nuclear is multi-meaning here. "Nuclear family" as a term in general refers to the traditional family unit of the parents and their children, but without all the extended family confusion. So Nate, Nora, and Shaun are a nuclear family, and when the Sole Survivor is reunited with Shaun the living members of the nuclear family are back together again. Plus it ties into the existing nuclear and atomic themes of Fallout as well as the importance of securing nuclear power for the Institute. XxSick DemonxX (talk) 02:19, July 23, 2016 (UTC)
Nuclear Family is because a Nuclear FAMILY is a term that refers to the traditional family unit, this being Shaun, Nate, And Nora. TAOA 18:40, July 24, 2016 (UTC)
REPLIED BY THE AUTHOR================
Thank you! Kind of difficult for non-native-english-speakers like me. Got it. It now sounds like a pretty nice name for the final quest.