Board Thread:General Discussion/@comment-28431168-20160617130858/@comment-30829949-20161029112738

I actually think that might be true, because if you go to San's workshop, you will see a photo described "You see Sans with people you don't recognize" or something like that. That could be Gaster and some other people, for all we know. Also, if you check the blueprints, the text will say "Strange symbols. or maybe it's just the handwriting." And remember, Gaster speaks in the Wingdings font, which is actually a font composed of symbols. So even if they are not father and son, I believe they are related.