Question: are ferb and phineas step brothers?
Answer: Role in Phineas and Ferb Phineas comes from a blended family, a decision creator Marsh made to reflect his own experiences growing up. His step-brother, Ferb, is his best friend. ... It is established that his mother, Linda Flynn-Fletcher married Ferb's father, Lawrence Fletcher, after dating him for a while in the 1990s.