And you just got your soul back too. Old Scratch there is tricky and opportunistic.

As far as your mom goes, it’s hard to just blame her for what’s happened. From what you’ve written it to does sound like she loved you all dearly. But in reality there are only so many hours in the day, and as your moms successor she needed to spend the time with you to teach you what that meant. Sadly that means less time for your siblings and as a kid that’s hard to reconcile. I can see Cas maybe wanting to avoid the topic, but if you asked him directly he might shed some light.

No matter what though, lots of us have shitty upbringings and somehow manage to not be serial killers. Jeremy made his choices and seems to have been deeply disturbed even before he moved out- at this point he has absolutely nothing to lose.