Their only known quotes are "But... Uncle... Krabs!" and "Grumble, grumble, grumble..."
All three of them look like their uncle Mr. Krabs, except for them being much younger and smaller, having shorter noses, and not having an undershirt and a belt. According to Mr. Krabs, they solve mysteries. Also, they finish each other's sentences.
I can turn into a skyscraper!
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Mr. Krabs says that they love to solve mysteries. This is most likely a reference to Huey, Dewey, and Louie from DuckTales.
^In the episode "Grandpappy the Pirate," Grandpa Redbeard refers to Mr. Krabs as his "only grandson," indicating that Mr. Krabs does not have any brothers