"Oh man, we're grandparents already." Sans is not ready for this responsibility, and so on. "But hey, you're givin' us a plan? That's great. I was almost getting sick of waiting for someone to come up with one."

if sans is sayori's dad but everyone including sayori is the universe's parent then how many times is sans a grandpa???

Anyway. Sayori laughs. "Don't mind Sans, he's just a lazybones. I'm ready, though! We've got this! What do you need us to do?"