George is the son of Jonathan Joestar and the late father of Joseph Joestar. George is also known as Jorge; especially in relation to the novel Jorge Joestar.

George Joestar II was born just months after his father died at the hands of Dio Brando. He grew up to marry Elizabeth who he saved as a child many times as they grew up together. They had a son named Joseph Joestar.

George became a pilot for the British Air Force during World War I. During his service, he discovered that one of his superior officers was a zombie that had been created by Dio and had been living secretly in darkness for years. George went to confront him, but unfortunately, was not trained properly in the art of ripple and died in the battle. Lisa Lisa mourned his death, which lead her to study the ripple and its use.

(Source: Wikipedia)