Betty Jo Flynn is old, but still a child at heart. Even though she is elderly, she is still very athletic and a great rollerskater. It is possible that she is very competitive. ("Crack That Whip")
Betty Jo Flynn was born with her identical twin, Lorraine. They were most likely born in Danville.
Early Adult Years
Betty Jo was part of the rollerskating derby early in her adult life. Her team, the Tri-State Bombers, almost won, but Hildegard Johnson cheated at last minute causing their team to lose. Ever since then, Betty Jo and Hildegard have been enemies. ("Crack That Whip")
When she was a little older she married Clyde Flynn. She gave birth to two young girls, Linda Flynn, and Tiana Weber (née Flynn).
When she became older, her daughter was married to Lawrence Fletcher, and she had three grandchildren: Candace, Phineas and Ferb. Every year, she invites her grandchildren and their friends to their cabin in the Danville Woods ("Get That Bigfoot Outa My Face!", "The Ballad of Badbeard"). Once, she visited the Flynn-Fletcher family along with her husband, Clyde. Once Phineas learned about her being in the rollerskating derby, they decided to build a rollerskating rink for a rematch with Betty Jo, Candace, and Ferb against Hildegard, Jeremy, and Suzy Johnson. The results were a tie. They had another rematch, but the results were unseen. ("Crack That Whip")
Phineas Flynn and Ferb Fletcher
Phineas Flynn and Ferb Fletcher are Betty Jo's grandsons. They are nice to each other, and she knows about their Big Ideas.
Candace is Betty's granddaughter, and she is very helpful. She tried to give Candace advice on enjoying the woods once. When they had the skating rematch, Betty made Candace the lead skater.
Ever since they were young, they were enemies. Betty Jo described Hildegard as a "cheater" while Hildegard called her a "loser". Around 50 years later, they instantly recognized each other. They still hated each other, and had two rematches. The first rematch was a tie, while the second is unknown.
Her name is listed incorrectly as "Betty Joe" in the crеdits of many episodes.
She has been a rival of Hildegard Johnson, specifically in roller derby.
She made an appearance in only one episode of Season 2, but it was confirmed that she would appear in Season 3. She would have 3 speaking roles in that season, but just a cameo and was pictured once in Season 4.