I think he is the uncle, maybe, of the man with scars. That Delores lady never said who his father was (onlyChildress, LeReaux (sp) something but I bet the sheriff is another illegitimate son of that Sam Tuttle (there might me quite a few of those in LE... ijs. Did Marty ever speak of his father? Just that his mom was a donna reed type right? I could easily be wrong).
I think its a religion of "they own". A cultish spinoff of santaria and voodoo, like they were saying. The tone in that lady's voice changes significantly when she asks, "You know carcosa?". Very sweet and gentle-like. As if talking to a child. It through me off. Had to watch it again.
Needless to say, I can't wait for next week.