| ...want zeg zou zelf, opruimen na afloop is nooit leuk.
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Heinz Doofenshmirtz's father is a man from Druelselstein. He owned a Spiztenhound puppy which, according to him, was like the son he never had and named him Only Son. He won Only Son in the game "Poke the Goozim With a Stick", which then grew up to become an award winning show dog, bringing him fame and fortune. ("Lawn Gnome Beach Party of Terror," "Got Game?"). He shows favoritism to Roger Doofenshmirtz, when Heinz Doofenshmirtz was made the lawn gnome, and not him. ("Lawn Gnome Beach Party of Terror)
- He is most likely deceased since he was not shown at the Doofenshmirtz family reunion ("Thaddeus and Thor")
- The only words he ever is shown saying are: "Bewege dich nicht!" (Do not move!) in Lawn Gnome Beach Party of Terror (flashback) and "Nеіn!" (No!) in Not Phineas and Ferb (flashback)
- Doofenshmirtz never had a good relationship with his mother as a child and was envious of his goodytwo-shoes brother,Roger, who stole all their mother's attention away from him, leaving Doofenshmirtz lonely. Whilst growing up, Doofenshmirtz developed evil plans to seek revenge on his brother so he could finally win his mother's heart once and for all.His father never payed attention to him so Doofenshmirtz often felt left out and worthless.
- Lawn Gnome Beach Party of Terror (Verschijnt in flashback(s))
- Lawn Gnome Beach Party of Error! (Spot the Diff episode) (Verschijnt in flashback(s))
- Got Game? (Verschijnt in flashback(s))
- Gaming the System (Alleen genoemd)
- The Monster of Phineas-n-Ferbenstein (Alleen genoemd)
- At the Car Wash (Alleen genoemd)
- Phineas and Ferb Christmas Vacation! (picture cameo)
- Not Phineas and Ferb (Verschijnt in flashback(s))