11 most dysfunctional sci-fi siblings (and why we love them)

Sibling rivalry: It’s an oldie, but a goodie. 

The classic trope has popped up in sci-fi lore plenty of times, and there are several brother-and-sister relationships out there that make for great drama (The Walking Dead) and pure ickiness (we're looking at you, Game of Thrones).

When used correctly, it’s a great storytelling tool. It gives you a ton of built-in backstory and shared experiences to mine. Plus, there aren’t many bonds stronger than blood. It always sets up the great question: How far will someone go for family?

So as we wait with bated breath to see how things will play out with beloved duo Daryl and Merle in the final three episodes of the The Walking Dead, here are 11 of our favorite dysfunctional sci-fi siblings.