I have studied martial arts for 29 years I have taught 18 I have studied wing chun in Hong Kong under Ip Chun,Guy Lai,Yung Kwok Wing and a few more I also teach San Da(SanShou) and Shuai Chiao under John Wang I have meet Chu Chi Ling actually in Hong Kong recently in November at a event for New Martial Hero Magazine he is a very nice and funny man very approachable I do not know if he is your same lineage though.