long-running story about the family and the brothers

I would say that they have a long-running story about the world of the supernatural and how brothers encounter it and are changed by it. I don't want to give spoilers here so I am saying vaguely. The long-running story is awesome, imo. I keep rewatching by the way, Season 5 by now, my "break-for-meal" show.

a self-contained story

S1-S3 have many self-contained stories. But the best part are those episodes that belong to the long-running story.

Good to see you commenting. You always give insightful and real comments

In the age of AI, that's the best compliment, thank you! :)