Board Thread:Questions and Answers/@comment-33646122-20171224073704/@comment-34645353-20180308012305

Zephyr5d wrote: If Gaster was the skelebros's father, then Papyrus would have at least something to memory him. Not only Sans and his picture of "three people smiling". Gaster possibly fell into the Core, which would have erased him from existence. Any memory of him would have been lost. Nobody would even be able to remember him at all. We don't know for sure that Gaster fell into the Core, though.