Flynn-Fletcher family

The  is the combined family of Linda and Lawrence, with family members from previous marriages.

Fletcher family
The Fletcher family is Ferb's side of the family tracing to the United Kingdom. Reginald Fletcher, his paternal grandfather, was famous for having been a stunt cyclist known as the "Flying Fishmonger".

Ferb's father, Lawrence Fletcher fell in love and was married with an unknown woman, with whom he had Ferb. Nothing is known about Ferb's biological mother, as she is never mentioned or a part of his life as of now.

Flynn family
The Flynn family is Phineas and Candace's side of the family originating in the United States. Its first known member is the spirited Clyde Flynn. His daughter Linda had a brief musical career as "Lindana". After her era of fame, Linda married and had two kids. Her first child was Candace Flynn, who is currently 15 years old. Her second is Phineas Flynn, who is a few years Candace's junior. At some point, not long after Phineas' birth, Linda's relationship with her then-husband abruptly ended and she was left taking care of her children alone.

Linda met a British archeologist named Lawrence Fletcher, who shared the history of having been left alone with his child after the untimely ending of a previous marriage. They fell in love and began dating, and not long afterwards, they married each other. Phineas and Candace gained Lawrence as a stepfather and Ferb as a stepbrother. They had lived together in a single blended family ever since.

Perry has become an honorary member of this family, having lived with them happily since Phineas adopted him from an animal shelter as a toddler.

Fletchers

 * Ferbgor, ancestor
 * Mr. Fletcher and Mrs. Fletcher, Reginald's parents
 * Reginald Fletcher, grandfather
 * Winifred Fletcher, grandmother
 * Lawrence Fletcher
 * Ferb Fletcher
 * Unnamed cousin
 * Uncle Angus
 * Aunt Maura
 * Beckham Fletcher (blond hair), cousin
 * Beckham Fletcher (brown hair, square glasses), cousin
 * Beckham Fletcher (brown hair, half-moon glasses), cousin
 * Pelé Fletcher (blond hair), cousin
 * Pelé Fletcher (brown hair), cousin
 * Eliza Fletcher, cousin

Flynns

 * Dr. Phineastein, ancestor
 * Constance, ancestor
 * Clyde Flynn, grandfather
 * Betty Jo Flynn, grandmother
 * Lorraine, great-aunt
 * Linda Flynn
 * Tiana Webber
 * Candace Flynn
 * Phineas Flynn

Pets

 * Two-headed cow (created, either deceased or released)
 * Platypus monster (created, either deceased or released)
 * Perry the Platypus
 * Goldie (released)
 * Steve (status unknown)
 * Bucky (deceased)
 * Barry (created,released)

Other relatives

 * Lorraine, sister of Betty Jo
 * Bob Webber, Tiana's husband

Future

 * Jeremy Johnson, Candace's probable husband.
 * Amanda, Candace's daughter and Jeremy's probable daughter.
 * Fred, Candace's son and Jeremy's probable son.
 * Xavier, Candace's son and Jeremy's probable son.
 * Isabella Garcia-Shapiro, Phineas or Ferb's wife.

Family tree
Unconfirmed people include: Jeremy Johnson (as Candace's Husband), Isabella Garcia-Shapiro (as Phineas or Ferb's wife, Phineas' more likely), and Xavier, Fred, and Amanda (as Candace and possibly Jeremy's children) ("Phineas and Ferb's Quantum Boogaloo").