Can not start final quest for Minutemen - Fallout 4
The final quest "The Nuclear Option", for the Minutemen faction, won't start for me when playing Fallout 4. I have completed "Defend the Castle" and I have visited the institute and downloaded the data and given it to Sturges. I just said that he would get back to me and then nothing. Talking to Preston, in Sanctuary, gives me nothing but the repeating quests to help settlements. The only thing I can think of is that while in the Institute I talked to Father and decided to join them, thinking I would infiltrate them and get some good stuff, now the Institute missions have started but I want to get back to the minute men and do the Nuclear Option quest. If it's joining the institute that caused it, can I unjoin by making them mad somehow?