Board Thread:Wiki Discussion/@comment-31960778-20170721040405/@comment-32182236-20170816194047

Actually, Sans and Papyrus more than likely came from another timeline, one where Gaster sill existed. Nobody seems to remember Gaster anymore, save for a few followers, and when you're in the same room as the followers, your cell phone does not work.

Sans and Papyrus are brothers, but who is their father? It would have to be another skeleton, would it not? Why can't Gaster be their father? Gaster built the CORE, yet the core still exists even though Gaster never did. Therefore, one could reason that Sans and Papyrus survived the erasing of Gaster in a similar manner. This means that Sans and Papyrus just showed up one day out of literally nowhere, their origin just doesn't exist in the timeline anymore.

But, the old timeline with Gaster does still exist, and Gaster is watching the new one. That's all I have to do say about Gaster. After all, it's rude to speak about someone who's listening.