Board Thread:Questions and Answers/@comment-27491885-20151228162741/@comment-29902162-20160907034243

I believe that Sans is the older brother. With his puns and behaviors he STILL seems more mature than Papyrus. I mean look at the facts, Papyrus pushes him around and he cooperates (sorta) because he wants to make Papyrus happy. Not to mention he seems more intelligent (idk if it's from experience or if he's a fast learner). I mean what DOES he do in his room? Probably plan pranks and practice his attacks. BUT WAIT! Why would he practice his attacks you might ask. Well, what is the one thing any good older sibling wants to be able to do for their younger sibling? Protect them. Yes, I think that Sans practices his attacks in his room (in theory) because he wants to be able to protect Papyrus. It all adds up to me, although I would love to see more theories!