Board Thread:Questions and Answers/@comment-31981697-20170724072306/@comment-34943331-20180821153313

Killergirl592 wrote: some says that gaster adopted them after the war of humans and monsters and their actual parents killed in the war and theres a theory that they were created in the lab with an extract of human souls and some told me that  gaster's wife which is their mother was killed in the was so the existance of sans and papyrus is realy unknown then in an episode they were humans that fall down and killed by asgore and they wake up on their coffin maybe, but  take it in perspective that sans and papyrus are very clueless in their own backgrounds because in the game they don't really mention their past. if they had it would of been, a true statement. so we have no idea if they even had parents at all and how they had came to be some say that they were created by gaster himself, i do not believe that theory though it does not really make logical sense.