Board Thread:General Discussion/@comment-28615841-20160601023944

I personally support the theory that Sans and Paps are Gaster's sons for a few reasons. Gaster seems to be the only skeleton, or skeleton-esque entity in Undertale. Also, Sans does seems to have connections of some kind with the G, not to mention his liberal usage of Gaster Blasters. Sans and Papyrus also speak in a diffrent font that is unique to the characters, as it is their typeface, and forms the name for the character, as does Dr. Wing Ding Gaster. Also, as said by the shopkeeper rabbit lady in Snowdin, Sans and Papyrus just appeared one day, which I believe is because they were in the Capital, living with Gaster when he was the royal scientisc (ie: pre-core accident Gaster). So when the "Gaster Disaster" happned, Sans and Papyrus would have moved to Snowdin, where nobody would have known them, as they just moved there, and the fact that they just, "asserted themselves", could also be explained by being Gaster's sons. When Gaster worked for Asgore, he probably would have connections of some sort with Undyne, which might be the reason Sans/Paps have authority, as being connected to the Captian of the Royal Gaurd. It's also good to mention that Sans and Gaster are both apparently able to control the appearence of their eyes, as they have shown the ability to "remove" their pupils on either command or when startled as a way of expressing possible emotion. On to Entry Number 17.
 * ENTRY NUMBER SEVENTEEN
 * DARK DARKER YET DARKER
 * THE DARKNESS KEEPS GROWING
 * THE SHADOWS CUTTING DEEPER
 * PHOTON READINGS NEGATIVE
 * THIS NEXT EXPERIMENT SEEMS
 * VERY
 * VERY
 * INTERESTING
 * WHAT DO YOU TWO THINK?
 * WHAT DO YOU TWO THINK?

Whats interesting here is that the entry mentions two people in the last line, one of which could be Dr. Alphys, and the other possibly Sans, or another scientist that we haven't met yet, maybe the royal scientist before Gaster. I haven't found any other discussion on this theory that go this in depth. Please let me know if you have more ideas, or thoughts that I shall try to answer. 