Question: Ricky Hui had a brother who is credited with popularizing what genre of music?

Context paragraphs:
Fantasia (2004 film): Fantasia is a 2004 Hong Kong comedy film produced, written and directed by Wai Ka-fai and starring Cecilia Cheung, Sean Lau, Louis Koo, Jordan Chan, Francis Ng and Christy Chung.  The film is a homage to classic Hong Kong comedy films which starred the Hui Brothers, Michael Hui, Samuel Hui and Ricky Hui, particularly the 1976 film, "The Private Eyes".

The Private Eyes (1976 film): The Private Eyes is a 1976 Hong Kong comedy film written, directed by and starring Michael Hui and co-starring his brothers, Samuel Hui and Ricky Hui, and also starring Shih Kien and Richard Ng in his second film role.  John Woo was the production designer and also co-director though he was uncredited.  Sammo Hung served as the film's action director and Jackie Chan was also a stuntman.  This is the third film of the Hui Brothers and it is the first film that established the Hui Brothers' comedies internationally.

The Contract (1978 film): The Contract is a 1978 Hong Kong comedy film written, directed by and starring Michael Hui.  The film also co-stars Hui's brothers, Samuel Hui and Ricky Hui.

Chocolate Inspector: Chocolate Inspector, also known as Inspector Chocolate, is a 1986 Hong Kong crime comedy film co-written and directed by Philip Chan, and also co-written, produced by and starring Michael Hui.  The film co-stars Anita Mui, Ricky Hui, Sibelle Hu and Roy Chiao.

Ricky Hui: Ricky Hui Koon-ying (3 August 1946 – 8 November 2011) was a Hong Kong actor.  He and his brothers, Michael and Sam, made several comedy blockbusters in the 1970s and 1980s.

Security Unlimited: Security Unlimited is a 1981 Hong Kong comedy film directed by and starring Michael Hui and co-starring his brothers Samuel Hui and Ricky Hui, who are known as the Hui Brothers.  Michael Hui was awarded Best Actor at the 1st Hong Kong Film Awards, making him the first ever recipient for the award.

Who Is the Craftiest: Who Is the Craftiest is a 1988 Hong Kong comedy film directed by Poon Man-kit and starring Ricky Hui, Bill Tung, Tang Pik-wan, Sammy Cheung, Tiffany Lau, Keung Chung-ping and Lo Hoi-pang.

Samuel Hui: Samuel Hui Kwun-kit (born 6 September 1948), usually known as Sam Hui, is a Hong Kong musician, singer, songwriter and actor.  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.  Hui is considered by some to be the first major superstar of Cantopop, known as the God of Song.

The Last Message: The Last Message is a 1975 Hong Kong comedy film directed by and starring Michael Hui, and co-starring Samuel Hui, with a cameo appearance by Ricky Hui.  This is the second film of the Hui Brothers.

Front Page (film): Front Page is a 1990 Hong Kong comedy film directed by Philip Chan and starring Michael Hui, Samuel Hui and Ricky Hui.  The film is a remake of the Hui Brothers' 1976 film, "The Private Eyes".

Supporting paragraphs: Ricky Hui Samuel Hui
Answer: Cantopop