How many movies have Alan Chui Chung-San and Norman Chui Siu-Keung acted in together?

They have worked on 7 movies together! Their first movie together was The Web of Death (1976) while their highest rated movie together was The 36th Chamber of Shaolin (1978). They have not worked together since The Denouement of Chu Liu Hsian (1983). They are most known for their action films together.