they were at the villain base with vanny, glitchtrap, Springtrap, and glamrock helpy most of them were either asleep or plotting then vanny who was awake came in to tell sundrop and moondrop something.

Vanny: "sundrop, moondrop you guys have a sister."

Sundrop: "WAIT WHAT?!"

Moondrop: "WAIT WHAT?!"

sundrop and moondrop immediately ran out to find their sister.