Mrs. Johnson

 is the mother of Jeremy Johnson and Suzy Johnson. She is the sister-in-law of Joe Johnson and probably the daughter-in-law of Hildegard. She is also related to Annabelle. She is in the Free-Form Jazz Band alongside Linda Flynn-Fletcher and Vivian Garcia-Shapiro. She has appeared several times (mostly in background shots).

Suzy Johnson
Suzy and her mother have yet to be seen interacting but it is safe to assume that she is unnaware of Suzy's darker personality.

Jeremy Johnson
It appears that Jeremy and his mother are quite close and Jeremy often helps her with anything animal. ("Misperceived Monotreme", "Bad Hair Day")

Background Information

 * Jane Lynch from Glee recorded dialogue for Jeremy's mother on January 13th, 2010, to be used in "Run, Candace, Run" and spoke for the first time in Canderemy.
 * She has an Associates degree in Zoology ("Bad Hair Day").
 * She calls herself "Hawk-Eye Johnson" ("Bad Hair Day")

Appearances

 * "Flop Starz"
 * "The Fast and the Phineas"
 * "Raging Bully"
 * "Run Away Runway"
 * "Mom's Birthday"
 * "Jerk De Soleil"
 * "Dude, We're Getting the Band Back Together"
 * "Comet Kermillian"
 * "Phineas and Ferb Musical Cliptastic Countdown"
 * "Just Passing Through"
 * "Canderemy"
 * "Run, Candace, Run"
 * "Bad Hair Day"