So THIS is the reason why Yotsuha called Uichi's family murderers, and why she singled out Uichi's dad in particular as the worst of the three. Sure, his mom and sis went along with it (and Utako caused the mess in the first place), but they did it out of desperation: dear old Dad did it of his own volition.
What I find VERY interesting is that, with the exception of the timing, this is exactly how Clover played their cards before. Rather than shift gears (since by now they must know their grip is slipping), they're just moving up their schedule. That suggests that, whoever they are, they don't have time travel like Yotsuha, and they aren't as adept at thinking on the fly. I have a few theories that I'll keep to myself for now.
Uichi's moment was even better than I was expecting: not only has he found the strength to stand up for himself, but he's realized how much Yotsuha is forcing herself for his sake. It makes his choice to break free all the sweeter.