Gertrude Zupermühltienatör

Not much is know about her, expect that she is Heinz Doofenshmirtz's grandmother. Her only appearance so far was in Tour de Ferb.

Background Information

 * Her last name includes the letter "ö" which is used in European countries including Germany, the country closest in relation to Druelselstein, where the Doofenshmirtz family came from. In fact, the name "Zupermühltienatör" doesn't exactly sound like Super Multi-Inator in German(or possibly Druelselsteinian)
 * Her last name isn't Doofenshmirtz.
 * She is called Frau Gertrude Zupermühltienatör, which is German for Ms./Mrs. Gertrude Zupermühltienatör. (The German title "Frau" is used for married and unmarried woman.)
 * Her maiden name is "Super Multi-inator".
 * She has the same name (Gertrude) as Heinz Doofenshmirtz's cousin, it's also the middle name of Candace Gertrude Flynn.