Forum:Who is Phineas and Candace's Biological Father and Ferb's Biological Mother?

Until this day, Phineas's blood father has never been mentioned once in the entire series, so a good possibility for a series finale would be if Phineas and Ferb found the truth of their real mother and father. Interestingly enough, Phineas Flynn does bear some resemblance to Dr. Doofenshmirtz, the show's main antagonist. An episode with this concept is not yet officially, but since the boy's heritage is still uncertain, it is very possible Disney could create such a special.