She is the daughter of George and Jane and the big sister of Elroy, who acts just like a normal teenage girl, only with more futuristic tastes.

Despite Judy still keeping modern-day "teenage girl" likes and dislikes, such as seemingly never-ending conversations on the telephone and shopping for outfits, she does not live exactly like a modern teenager, obviously because of the time the show takes place, because she enjoys taking advantage of the many gadgets at her grasp because of the technology (like controllable zero-gravity switches made for accomplishing popular dance moves of the show's time or for other uses).

You were born in the past by the year of 2001, and it was the year 2062, because you used a serum that would keep you 22 years old forever! Then, you bumped into Judy at the futuristic mall!

”H-Huh? Hey! Watch your movement! You almost creased my dress, ya’ know? Gosh!”