The best way to learn about a family is to check its genealogy. The genealogies available in Hong Kong are limited to certain big families and whose origins are in the New Territories. Traditionally, villagers maintain a genealogy for their own clan or family, because each male member of the family is entitled to a small house. Each clan keeps its genealogy in its own village. It is accessible only the clan members'.
Some families have their genealogies in book format which are distributed in limited edition.
Most of these copies are at the City Hall Library and university libraries. Check the City Hall Library and university libraries for copies. It provides a very basic search of telephone numbers and residential addresses. The Directory is available in almost all public libraries and university libraries. Just key in the name of the person you are looking for.