Sans is Married to Frisk has a daughter named Kayla Sans has a brother named Papyrus After Toriel left to go to the ruins, Sans would go to the Ruin door at Snowdin and knock/talk with Toriel A lot of monsters are trying to get used to surface life but it’s extremely hard for them Sans and papyrus dad is W.D. Gaster but he fell into his own creation shattering across time and space (First royal Scientist)