Board Thread:Questions and Answers/@comment-33646122-20171224073704/@comment-34435509-20180122180405

Killergirl592 wrote: seriously in some episodes that i watched he is conducted a their adoptive father

Actually no some people say they are but they are not they are actually parts of W.D Gaster. Sans is Gaster’s left side of the brain and Papyrus is his right that is also why Papyrus relies on Sans for on most Information like to confirm if your “Human” and on “The Sun” for example. Also Sans & Papyrus just appeared and “Asserted themselves” into Snowdin and they also know about Time & Space but Sans is the only who knows about the Timelines and what is being affected in them