Arthur and D.W. in “Unfinished Business”

And since then, I always wore glasses. Does that solve your mystery?

Yes, I guess... but it wasn't as good as having a lost brother. [sees a picture of a much younger Jane and David dancing to disco.] And, look. Who's this weird guy with Mom?

This is Dad.

But Dad doesn't have a beard, Arthur. But maybe Mom's divorced. I gotta wake her up now, and demand an explanation!

D.W.! Wait, D.W.! D.W.! [runs after her.]