You know how they say there are so few pure bloods left that they're all related in some way?
I think Ron must have some Trelawney=Seer blood. Just a little something. Which could also, in part, explain why he always defended Professor Trelawney from Hermione at first.
It's kind of wild. I think I've been reading too many of those THG-Divergent theories/headcanons.

HP fandom!