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The series never says, but there are many fan theories. Most of them think that Dr. Doofenshmirtz is their real father. Here are some theories related with with their real father: http://disappearedflynn.wordpress.com/
in one of Dr. Doofenshmirtz flash backs the one where the phineas and ferb reverse engineer Dr. Doofenshmirtz inventions he was dating Linda (Phineas's blood mom) so that might mean that he had Phineas with her.
What else can I help you with?
Why is ferb phiness step brother?
Ferb is Phineas' step brother because Ferb Fletcher is the real son of Lawrence Fletcher, who is Phineas' step father. Candace Flynn and Phineas Flynn are the real sons of Linda Flynn Fletcher.
How can ferb and Phineas be step brothers if ferb is adopted?
Ferb is Phineas' step brother and the Dad's real son. Phineas and Candace are the Mom's real kids and the Mom and Dad got married when all the kids were small. The dad's side of the family is from England and are in a couple of episodes and the mom's parents are in a couple too. The mom's parents are in the episode were they go camping.
What is Phineas and Ferbs relationship?
Ferb is the stepbrother of candace.Phineas and candace are real siblings.
What is Isabella's address on Phineas and Ferb?
Well , no one really knows. She lives across from Phineas and Ferb (Whose real name is Frank)
What is the real face of Phineas and Ferb?
weird, demented looking people
Why is ferb phiness step brother?
Ferb is Phineas' step brother because Ferb Fletcher is the real son of Lawrence Fletcher, who is Phineas' step father. Candace Flynn and Phineas Flynn are the real sons of Linda Flynn Fletcher.
Who is Phineas and Ferb's father?
There Father's Name Is Lawrence.
What are the release dates for Phineas and Ferb - 2007 Phineas and Ferb Interrupted A Real Boy 3-8?
Phineas and Ferb - 2007 Phineas and Ferb Interrupted A Real Boy 3-8 was released on: USA: 15 July 2011
What is Phineas real name in Phineas and Ferb?
His full name is Phineas Flynn.
Is Phineas and Ferb a fantasy?
sadly they are not real cuz phineas is cute
How can ferb and Phineas be step brothers if ferb is adopted?
Ferb is Phineas' step brother and the Dad's real son. Phineas and Candace are the Mom's real kids and the Mom and Dad got married when all the kids were small. The dad's side of the family is from England and are in a couple of episodes and the mom's parents are in a couple too. The mom's parents are in the episode were they go camping.
When will phinies and ferb get busted for real?
Phineas and Ferb got busted for real tons of times.
What is Phineas and Ferbs relationship?
Ferb is the stepbrother of candace.Phineas and candace are real siblings.
What is Isabella's address on Phineas and Ferb?
Well , no one really knows. She lives across from Phineas and Ferb (Whose real name is Frank)
What is Ferb's real name from Phineas and Ferb?
It is just Candace The Complete Name is Candace Katherine Flynn
What Phineas and Ferb episode was on fri at 9pm?
a real boy
Are Phineas and Ferb real?
They're cartoon characters. Make of that what you will.
