Talk:Papyrus and Sans's House/@comment-26696192-20161024075411/@comment-30932779-20170103020429

"Sans's" is one of the correct grammatical methods of describing ownership to a person with an 'S' as the last letter in their name. To show singular possession of a name ending in 's', some writers add just an apostrophe. Others also add another 's'. It just depends on  what the writer feels is correct.

Hope this helps :)