I came across this interview tonight with Chris Hemsworth, it’s a couple of months old but I hadn’t seen it before. In it he discusses the less than clear-cut relationship between Thor & Loki and compares it to general sibling relationships. (There’s video as well as write-up; watch the video.) There’s not much to the interview though, this is the main quote; there’s a bit more in the article & video.
It’s what I loved about the comics. It was never clean and cut and that’s it,” he said about whether or not Thor and Loki would repair their damaged relationship. “It was always like, Thor would forgive him, they’d be friends, and Loki would betray him again. ‘You idiot, Thor! Again?‘ But it was different than your normal good guy, bad guy scenario. They’re brothers, you know? Anyone with siblings understands that. ‘That’s it, I’m never talking to you again… want to play football?