The Kid (1950)
The Kid, also known as Kid Cheung and My Son A-Chang, is a 1950 Hong Kong drama film starring the then 10-year old Bruce Lee in his first leading role in the title role of "Kid Cheung", based on a comic book character written by Yuen Po Wan, who also has a role in the film. Co-starring Lee's father, Lee Hoi-chuen, this is the second film in which the father and son worked together on, the other being The Birth of Mankind in 1946.
More at Wikipedia.