'I was one of those social rejects,' he says on the Official Crumb website. In high school, Crumb was not very popular and often felt alienated. Crumb also has a younger brother, Maxon, who creates abstract, Cubist-influenced oil paintings and lives in San Francisco. The two shared a love of comics and co-wrote comics together, which included early renditions of Crumb's famous character, Fritz the Cat. Crumb credits his older brother, Charles, for being his biggest influence growing up.
Moving frequently during his childhood, Crumb and his family eventually settled in Delaware in 1956 when his father retired after 20 years in the US Marine Corps. Robert Crumb was born in West Philadelphia on August 30, 1943, to a Marine father and a Catholic mother.