Board Thread:Fun and Games/@comment-30160565-20180708073319/@comment-35757757-20190612193239

Well, Sans has an attack called a Gaster Blaster...

That’s basically the only CANON connection between the two without speculation stuff

They aren’t canonically a family at all

Gaster doesn’t even have a canon design. Any idea is just speculation

So yeah. There’s only one “confirmed” connection

Even then Toby Fox hasn’t said anything. Nobody’s ever even asked as far as I know

So yeah