Sorry to disappoint, but I wouldn't expect more from The Family. That was part of Angel, Durai, and Latch/Scratch's background. It wasn't meant to be a huge conspiracy theory, just a part of Angel's past that he inherited that he turned his back on, and tried to become his own man. It gave him common ground and an understanding of who these people are/were more than anyone. In chapter 8, when they showed up, he knew exactly what kind of people he was dealing with. The Family was also meant to give more depth into Scratch and Durai's relationship, and how he retains power, but you see how that turned out.
So, for me, I think it's wrapped up well as its intention is more to explain the past than the future.
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