
At that time, yes. But he also manifested later ( the artist messed up his eyecolor). Just because Chase was normal back then doesn't mean that how he is now is solely the family's fault. Some trauma? -certainly, but his violent behaviour probably more because of manifesting. I mean Keith has anger issues. And those two have mild problems compared to the ones manifested early.
And look at his dad, he also manifested late, but fried his brain due to pheromeons accumulation, becoming emotionless and dependent on his dominant omega.
There never was incest. And I actually can't see anyone of those we know doing that.
yeahh i wanted to see more of chase's family but...given the spoilers about his father, the other sons and the incest(?) thingy going on... poor chase is literally the only one sane in that household