The two people who can aid you most in your search for info on the Lau family are Lau Kar Bo or contact SiFu Mark Ho in Hong Kong

Lau Jam

Lau Gar Leung

Mark Ho (Mark Houghton (sic?))

Lau Kar Bo (Franky Lau)

I believe the above lineage to be it that order. A web search will bring up web site for that above.

Hope that helps at least point you in the right direction