So consider

The main five and the dads decide to drop in surprise visit DC in Washington

When they arrive to the building where he works and go into his office, they don't expect him to be meeting with someone

And it's weird too cuss DC's standing with his head to the ground while this person just berates him over and over
The only thing DC says is give vague responses like "yes" "no" "working" or even the occasional "yes sir"

And then it slowly hits them
That's Confederation, that's DC's father

Bonus if Florida figures it out first

Florida: *oddly calm* Hey Dee, is that your dad?
DC: *giving him a look begging please don't*
Confederation: Your own states don't know about me? What kind of Fed are you, yes I'm his dad unfortunately.