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This is a list of the SpongeBob SquarePants characters' families.
SpongeBob's family
Patrick and Gary's family
Squidward's family
- Mrs. Tentacles - Squidward's mother.
- Grandma Tentacles - Squidward's grandmother.
- Mr. Tentacles - Squidward's father.
- Squeeze Tentacles - appeared in "Stanley S. SquarePants" has blonde hair.
- Hopalong Tentacles- an ancestor of Squidward that appeared in the time of SpongeBuck.
- Squidly - Squidward's 7th great grandpa mentioned in "Dunces and Dragons."
- Squog - Squidward's eldest caveman ancestor, seen in "Ugh"
Mr. Krabs' family
Mr.Krabs
- Pearl Krabs - Mr. Krab's daughter, a whale.
- Mrs. Betsy Krabs - Mr. Krabs' mother and Pearl's grandmother.
- Mr. Victor Krabs - Mr. Krabs' father, not seen, but it was revealed in "My Pretty Seahorse" that he gave Eugene $1.00 when he was five that he loved. Due to his absence in flashbacks of Mr. Krabs' early life in Friend or Foe it is likely that he passed away soon after this event. He also appeared in an old photograph in Betsy's house.
- 'Mrs. Krabs' - Eugene H. Krabs' deceased wife. She is the mother of Pearl. In a book, Mr. Krabs says that Pearl "takes after her mother," which indicates that she is a whale.
- Prehistoric Krabs - The crabs that Patar ate in "Ugh".
- King Krabs - Seen in "Dunces and Dragons", he is the first one in the Krabs Family to sell and market Krabby Patties. Although he stole the idea from SpongeBob, he tells everyone that it was his idea
- Princess Pearl - King Krabs' daughter who got kidnapped by Planktonimor in the episode "Dunces and Dragons".
- Great-Great Grandfather Krabs - great great grandfather of Eugene H. Krabs. He invented the Spend Thrift Money Folder.
- William Krabs - Owner of the Krusty Kantina, the saloon of Dead Eye Gultch.
- Nephews - Mr. Krabs' nephews who appeared in Stanley S. SquarePants. According to Mr. Krabs, they solve mysteries.
- Grandpa Redbeard - Mr. Krabs' pirate grandfather. He appeared in "Grandpappy the Pirate."
Plankton's family
- Karen - Plankton's Computer Wife.
- The Plankton Family - A large number of plankton are Hillbillies seen in the episode "Plankton's Army". They are cousins of Sheldon J. Plankton, but are not evil geniuses like him. They all seem to like Root beer. Some of them are named: Zeke, Rufus, Jeke, Billy Bob, Billy Jim, Billy Billy Bo Willy Banana Fana Fo Filly, Doug, Enis, and Rainchild
- Clem - Another member of the Plankton family. He is Plankton's illiterate cousin.
- Mr. Plankton - Plankton's father. He appeared in the book Hooray for Dads. He sometimes can embarrass his son, similar to Mr. Krabs' embarrassing Pearl.
- Mrs. Plankton - Plankton's mother. She was only mentioned in Nicktoons Unite! and Creature from the Krusty Krab, Plankton thinks she would be proud of him if he took over the world and she liked him the best.
- Gram Gram (or Grandma) - Plankton's grandmother, as mentioned in "Krabs vs. Plankton." She appeared in Gramma's Secret Recipe.
- Granddad - Plankton's grandfather, seen in "One Coarse Meal", but only in a nightmare.
- Dead Eye Plankton - He appeared in "Pest of the West."
- Lord Planktonamor - He appeared in "Dunces and Dragons" as a villain.
- Spot - Plankton's Pet. He appeared in "Plankton's Pet". Because he is a pet he is technically not part of his family.
- E.M.I.L.P.- Plankton's mother in-law and Karen's mother, as mentioned in Single Cell Anniversary and The Algae's Always Greener.
Mrs. Puff's family
- Mr. Puff - Mrs. Puff's deceased husband; he was turned into a lamp by a fisherman seen in the episode, "Krusty Love". In that episode, "Mr. Krabs asked what happened to Mr. Puff and SpongeBob said that Mrs. Puff does not like to talk about her dead husband. In The SpongeBob SquarePants Movie, there was a pufferfish made into a lamp that came to life; that may or may not have been Mr. Puff.
- Polene Puff - Mr. Puff's ancestor that appeared in the Dead Eye Gultch in the episode "Pest of the West".
Sandy's family
- Mr. Cheeks - Sandy's father, who was referenced in "Sandy, SpongeBob, and the Worm". Sandy calls him "Pa" or "Pappy." He made a live appearance in the book "Hooray for Dads." He looks a lot like Sandy except with a gray mustache and some other male attributes.
- Mrs. Cheeks - Sandy's mother.
- An unnamed family member appeared in the episode "Stanley S. SquarePants" as one of the family members of the characters who was turned down by Mr. Krabs for a job at the Krusty Krab. His fur was more unmaned and he had a pipe, a bagpipe, and a kilt. He resembles a Scottish squirrel, which could indicate that Sandy's ancestors lived in Scotland before Texas.
- Rosie Cheeks - Sandy's great aunt, Mr. Cheeks' aunt. Rosie discovered oil in Spindletop, Texas. Mentioned in "Pest of the West."
- The Dark Knight - The Dark Knight otherwise known as "Medival Sandy" is seen in the episode "Dunces and Dragons".
- Randy - Sandy's twin brother, he was mentioned in Rodeo Daze.
- Unnamed Cheeks - is her ancestor that appeared in Pest of the West short Saloon Door Sorrows.
- Earl Cheeks - Sandy's cousin, a woodchuck appeared in Squirrel Record.