George Grossmith was born in Islington, London, and grew up in St. Pancras and Hampstead, London. His father, also named George (1820–1880), was the chief reporter for "The Times" and other newspapers at the Bow Street Magistrates' Court and was also a lecturer and entertainer. His mother was Louisa Emmeline Grossmith née Weedon (d. 1882). Over the years, Grossmith's father spent less of his time at Bow Street and more of it touring as a performer. As a young man, Grossmith was usually credited as "Jnr" to distinguish him from his father, especially when they performed together, but for most of his career, he was credited simply as "George Grossmith". Later, his actor-playwright-theatre manager son was credited as George Grossmith "Jr" rather than "III"; some sources confuse the two men. His other son, Lawrence Grossmith, was also a successful actor, primarily in America.