It's possible that Proctor should have known, especially before he killed the kid, and if he did know, that might be why he did go over board... Is Proctor protecting his niece or farming his wife? If (And I do mean if.) you can marry your first cousin inside the bounds of their culture, it would not be too, much of a stretch to marry a niece?
Jason had been hiding, keeping a low profile since he got to Banshee, and that could have been what killed him, unless Proctor actively wanted to hurt "Lucas" and where he found the boy was just a coincidence.
Once upon a time Robin, Jason Todd, became the Super AntiVillain the Red Hood in DC Comics.