If we were meant to fly, we'd have propellers on our heads and jet engines on our backs.
— Grandpa SquarePants, "The Sponge Who Could Fly"
Grandpa SquarePants
Physical appearance
Gender: Male
Color: Pale yellow
Eye color: Light blue
Classification: Sponge
Spouse: Grandma SquarePants (wife)
Children: Captain Blue SquarePants, Harold SquarePants, and Sherm SquarePants (sons)
Parents: SpongeBob's Great Grandmother (possible mother)
Grandparents: SpongeBob's Great Great Grandmother (possible grandmother)
Grandchildren: SpongeBob, Stanley, BlackJack, and Todd SquarePants
Ancestors: SpongeBuck SquarePants
Primitive Sponge
Descendants: SpongeTron
Unnamed Great Great Grandson
Other relatives: Margaret SquarePants (daughter-in-law)
Series information
First appearance: "Rock Bottom" (mentioned)
Latest appearance: "The Sponge Who Could Fly" (mentioned/shown in thought bubble)
Portrayer: Tom Kenny
List of characters

Grandpa SquarePants is the father of Harold, Sherm, and Blue. He is also the paternal grandfather of SpongeBob, Todd, BlackJack, and Stanley. He is voiced by Tom Kenny. He very much resembles SpongeBob's square shape.


He is first mentioned in "Rock Bottom," and is depicted in SpongeBob's mind in "The Sponge Who Could Fly." He is known for his wise sayings, which include "If we were meant to fly, we had have propellers on our heads or jet engines on our backs." ("The Sponge Who Could Fly") and "Never run for a bus, especially one that's going up at a 90 degree angle." ("Rock Bottom").


He was born to a Mr. and Mrs. SquarePants. Mrs. Squarepants might be SpongeBob's Great Grandmother.

He married a female sponge who is now called "Grandma SquarePants."

Together, they may have bought the home that is now known as Grandma SquarePants' House, but this has not been confirmed.

They had Harold, Sherm, Blue, and one other son and one daughter, one other son and two daughters, two other sons and one daughter, or three other sons.

He once said "Never run for a bus, especially one that's going up at a 90 degree angle."[1] and "If we were meant to fly, we had have propellers on our heads or jet engines on our backs."[2]

Late in his life, he had a cane[2] then eventually a walker.[1]



Sponges (VE)

BlackJackCaptain Blue SquarePantsDrifterEnsignGirly TeengirlGrandma SquarePantsGrandpa SquarePantsHarold SquarePantsMargaret SquarePantsPrimitive SpongeSherm SquarePantsSpongeBob's GrandsonSpongeBob SquarePantsSpongeBuck SquarePantsSpongeGarSpongeTronStanley S. SquarePantsTodd SquarePants

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