Where did the trope of "Kill the Sire, the progeny is cured/destroyed" come from? Are there any interesting uses of it?

I mostly know it as a thing some vampire B-movies do to give a happy ending after killing the monster.

That said, where did it start?

Are there any interesting uses of it (meaning, something that goes deeper / more complex than just the heroes killing the arch-vampire to rescue a friend) ?