Mandy

 is the older sister of Thaddeus and Thor. She is driven crazy by the antics of her brothers, similar to Candace is by Phineas' and Ferb's activities.

Personal Life
During her visit to her aunt Mrs. Weaver's house, a next-door neighbor of the Flynn-Fletcher family, she overheard Candace describing Phineas and Ferb's antics, and it quickly escalated into a point of pride that her brothers were more obnoxious than Candace's. She acted as lookout and cheerleader for her brothers during their fort-building competition with Phineas and Ferb. In the end, after Phineas and Ferb beat her brothers in the fort building contest, she admits that Candace's brothers are more obnoxious than her own brothers ("Thaddeus and Thor").

She owns a "Stop The Busting" program ("Perry the Actorpus").

Physical Appearance
Mandy is as tall as Candace. She wears a light blue sleeveless t-shirt and navy blue jeans. She has a curly brown hair.

Background Information

 * Candace's nickname "Candy" may have been the source of Mandy's name.
 * She somewhat resembles Candace due to the long neck.
 * She is voiced by Aliki Theofilopoulos Grafft, a storyboard artist and writer on Phineas and Ferb since 2006.

Appearances

 * "Thaddeus and Thor"
 * "Perry the Actorpus"