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Scooby's Family Tree
Dada and Momsy Doo
Scooby's parents
Dada and Momsy Doo are owned by Mom and Pop Rogers.
Appearance:
The Ghouliest Show on Earth (The 13 Ghosts of Scooby-Doo)
Wedding Bell Boos part 1 and 2 (The All New Scooby and Scrappy Doo Show)
The Weredog of Doo Manor (A Pup Named Scooby-Doo)
Curse of the Collar (A Pup Named Scooby-Doo)

Dixie-Doo
Scooby's cousin
Appearance:
Showboat Scooby (The New Scooby-Doo Mysteries)

Dooby-Doo
Scooby's cousin
Dooby-Doo is Scooby's cousin. He is a singer, and one of the only Doo's to have hair on his head.
Appearance:
The "Dooby Dooby Doo" Ado (The New Scooby-Doo Mysteries)

Grandpa Scooby
Scooby's grandfather
Grandpa Scooby lives at Scooby Manor, which is Scooby's family home.
Appearance:
Scooby's Roots (The Richie Rich/Scooby-Doo Show)

Great-Grandpa Scooby
Scooby's great-grandfather
Great-Grandpa Scooby appears as a ghost from the Civil War.
Appearance:
Scooby's Roots (The Richie Rich/Scooby-Doo Show)

Horton-Doo
Scooby's uncle
Horton-Doo is interested in science and monsters.
Appearance:
The Weredog of Doo Manor (A Pup Named Scooby-Doo)

Howdy-Doo
Scooby's brother
Howdy-Doo enjoys reading supermarket tabloids newspapers.
Appearance:
The Curse of the Collar (A Pup Named Scooby-Doo)

Ruby-Doo
Scooby's sister
Ruby-Doo is Scrappy's mother.
Appearance:
Scrappy's Birthday (The Scooby-Doo and Scrappy-Doo Show)
Curse of the Collar (A Pup Named Scooby-Doo)

Scooby-Dee
Scooby's cousin
Scooby-Dee was an actress, who had a southern accent. She appeared in "The Chiller Diller Movie Theater" which aired on October 1, 1977.
Appearance:
The Chiller Diller Movie Thriller (The Scooby-Doo Show)

Scooby-Dum
Scooby's cousin
Voice: Daws Butler
Scooby-Dum is a grey Great Dane with buck-teeth who is quite dim-witted, but he longed to be a detective. Scooby-Dum lives with Ma and Pa Skillet in the Okefenokee swamp of southern Georgia.
Appearance:
The Gruesome Game of The Gator Ghoul (The Scooby-Doo Show)
The Headless Horseman of Halloween (The Scooby-Doo Show)
Vampire Bats and Scaredy Cats (The Scooby-Doo Show)
The Chiller Diller Movie Thriller (The Scooby-Doo Show)
Laff-A-Lympics as a member of the Scoobie Doobies

Scrappy-Doo
Scooby's nephew
Voice: Lennie Weinrib (1979)
Don Messick (1980 - 1997)
Scott Innes (2002 - present)
Scrappy is the son of Scooby's sister Ruby-Doo.
Appearance:
The Scooby-Doo and Scrappy-Doo Show
The Scooby-Doo/Scrappy-Doo/Puppy Hour
The All-New Scooby and Scrappy-Doo Show
The New Scooby-Doo Mysteries
The 13 Ghosts of Scooby-Doo
Scooby-Doo Meets the Boo Brothers
Scooby-Doo and the Ghoul School
Scooby-Doo and the Reluctant Werewolf
Scooby-Doo (live-action movie)

Skippy-Doo
Scooby's brother
Skippy-Doo is Scooby's triplet brother. He is highly intelligent and the only sibling to wear glasses.
Appearance:
The Curse of the Collar (A Pup Named Scooby-Doo)

Whoopsy-Doo
Scooby's cousin
Whoopsy-Doo is owned by Gaggy Rogers, Shaggy's uncle. Whoopsy is a clown.
Appearance:
Wedding Bell Boos part 1 and 2 (The All New Scooby and Scrappy Doo Show)

Yabba-Doo
Scooby's brother
Voice: Don Messick
Yabba-Doo was owned by Deputy Dusty in the southwest. His catch phrase was "Yippity-Yabbity-Doooo!!!"
Appearance:
The Scooby-Doo/Scrappy-Doo/Puppy Hour

Yankee Doodle Doo
Scooby's ancestor
Yankee Doodle Doo came to Plymouth, Massachusetts aboard the Mayflower with Shaggy's ancestor, McBaggy Rogers.
Appearance:
A reference was made to him in Wedding Bell Boos