I never watched it, and I've only read maybe three fics about it, but it seemed like the angst potential was there. Again, I read almost exclusively in femslash fandom, so in the fic I saw, all of the focus was either on Sarah or Cameron. Femslashers, almost to the point of pathology, do not seem to write about men, so John was barely mentioned and even having not read in the fandom, I can pretty confidently say that his uncle never showed up in a femslash fic (though I'm happy to admit to being wrong about that). Seriously, if you just read the femslash for that show, you'd probably be surprised to find that men even existed.