Phineas and Ferb

Phineas and Ferb is an American cartoon series created by Dan Povenmire and Jeff "Swampy" Marsh.

Synopsis
The show follows the adventures of stepbrothers Phineas Flynn (Vincent Martella) and Ferb Fletcher (Thomas Sangster), who live in the fictional city of Danville, in a (never specified) tri-state area, as they seek ways to occupy their time during their summer vacation. Often these adventures involve elaborate, life-sized and ostensibly dangerous construction projects. Phineas's older sister, Candace Flynn (Ashley Tisdale), has two obsessions: "busting" Phineas and Ferb's schemes and ideas, and winning the attention of a boy named Jeremy (Mitchel Musso). Meanwhile, the boys' pet platypus, Perry, acts as a secret agent for an all-animal government organization called the O.W.C.A. ("Organization Without a Cool Acronym"), fighting Dr. Heinz Doofenshmirtz.


 * Source: https://en.wikipedia.org/wiki/Phineas_and_Ferb

Featured relative giantess: Candace Flynn

 * 1) She is a main character.
 * 2) She is a normal-sized human, therefore, she is not a natural giantess or a giantess by default.
 * 3) In all episodes from the following list, she was a relative giantess.