I like the idea more that Gaster was not actually the 'father' of the skelebros. I think in my app I referenced my preference that Sans, because he has many jobs, could have worked with the Royal Scientist, and that Alphys also helped until Gaster fell into the core and 'died'. And Papyrus was just busy being a sentry/making puzzles/trying to solve junior word scrambles. But that's just my preference, G.A. Haruki's word is final when it comes to this rp.