Part 1

Poly! The lost boys, so the boys have been with their s/o for a while now, having met them due not only their elegant gothic style but their personality.
But one night their s/o tells them that they want the boys to meet their family.
They agree, after a bit, the s/o driving them all in their hearse up to an old haunted looking mansion where they meet (and discover) that they are the eldest child of Morticia and Gomez Addams and meet their family.