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Grandma Krabs is the parental grandmother of Eugene H. Krabs, the wife of Redbeard Krabs, and the mother of Victor Krabs. She first appears in a picture in Mr. Krabs' wallet in the episode "The Sewers of Bikini Bottom."
She is a pale-red, wrinkled crab with gray hair and skin tags. She has no teeth and wears dentures made out of cardboard.
"The Sewers of Bikini Bottom"
She married Redbeard Krabs. The two later had Victor Krabs.
At some point, she gained a pair of false teeth that were made out of cardboard.
She appears as Mr. Krabs' tattoo on his chest.