I ran into something similar with my last playthrough. If I remember the incident correctly, one of the Minutemen (the one closest to the front door) is the "leader". I had to pester him several times before he stopped saying "General." and opened up some dialogue options. Once that happened, I was able to proceed with the quest with minimal issues.
There were a couple of speech checks to pass in order to get them to stand down and let me go talk to the people inside the house. There were also a couple of speech checks to pass inside the house, but eventually everyone walked away from the encounter.