Part of my reverse!verse au:
Sometimes, Cas and Gabe’s dad dropped them off at Missouri Moseley’s house when he was off to hunt the more dangerous monsters/demons. He hoped she’d teach them how to shoot guns or track monsters or speak some of the older languages. Gabriel swore he learned most of the technicalities of hunting from her; Castiel teased that Gabe really only learned how to cook from her.
What they hardly mentioned – like a secret they kept close to their hearts – was that she taught them how to be children.