Like most of the SquarePants family members, Sherm is square in shape and has pores. He has several buck teeth, pants like SpongeBob's, a bow tie, brown eyes, and a watermelon in his nose.
In the episode "Stanley S. SquarePants," Sherm sends his son to SpongeBob's house due to his inability to hold down a job and the fact that he is irresponsible and ruins everything he touches. Sherm took away several privileges of his adult son, in which Stanley has referenced by telling SpongeBob that his father never allowed him to watch TV, or touch the refrigerator or toilet.
Despite being the father of Stanley, he calls him "Uncle Sherm."
He was born to at least five or six children of Grandma and Grandpa SquarePants. His known siblings are Blue SquarePants, Harold SquarePants, and possibly other siblings.
When he became an adult, he married an unknown wife. They had a son named Stanley S. SquarePants.
Sherm apparently never lets Stanley do anything because of Stanley's destructive nature. At some point, he had enough and sent Stanley away to SpongeBob's house to be straightened out. Although it has not been shown, it can be implied that he and his son have a tense standing as Sherm's letter has the words "I'm free" written at the bottom. Even though it wasn't shown, it can be said that Stanley went home or at least left SpongeBob's house since Stanley hasn't been seen since his debut episode, "Stanley S. SquarePants."
At some point, Sherm put a watermelon up his nose and got a picture taken of it.
Sherm is mentioned various times in the series in the episodes "Krab Borg" and "Stanley S. SquarePants," but is never seen except briefly in "Pest of the West" when SpongeBob shows a picture of him with a watermelon sticking out of his nose. He is also seen in a picture in "The Check-Up."