Explanation

The vks, Chad Charming, and Audrey Rose are originally from the ouat (Once Upon a time) but were stolen by their descendants' parents.

A few years later, Fairy Godmother accidentally summons them to Auradon because of Ben.

Which allowed for the stolen children to be returned.

As you can imagine, the ouat versions of their parents aren't too pleased with their fear of adults.

And they certainly don't know how to feel when their kids inherit their powers.

It's bound to be a bumpy ride.