Board Thread:Questions and Answers/@comment-27491885-20151228162741/@comment-37231405-20181219204450

well, it makes complete perfect sense that sans is the older brother, after reaserch here on this website and watching a video, it has to be sans that is the older one, to make this statement true, in UNDERSWAP they say Papyrus is the older one, and UNDERSWAP is the OPPISITE or SWAP of the original, well back to the "Is sans or papyrus older" question, sans can remember the human monster war, where his and papyrus's (who was to young to remember) died. that's my awnser AND reasoning for who is/was (if you did the genocide route or not) older