Ricky Hui had a brother who is credited with popularizing what genre of music?
Ricky Hui:  He and his brothers, Michael and Sam, made several comedy blockbusters in the 1970s and 1980s. Samuel Hui: Samuel Hui Kwun-kit (born 6 September 1948), usually known as Sam Hui, is a Hong Kong musician, singer, songwriter and actor. Samuel Hui:  He is credited with popularising Cantopop both via the infusion of Western-style music and his usage of vernacular Cantonese rather than written vernacular Chinese in biting lyrics that addressed contemporary problems and concerns.
Cantopop