Question: Ricky Hui had a brother who is credited with popularizing what genre of music?
Sentence (from "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.
Relevant evidence: No