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Leung Yee Tai > Dr. Leung Jan (Leung Tak Wing) > Leung Bik > Ip Man 葉問 (Yip Gai-Man) > Jiu Wan (Chiu Wan) 招允
Chan Wah Shun -> Jiu Jow -> Jiu Wan
Chan Wah Shun -> Chan Yu Min -> Jiu Wan
Friend and a private student of Yip Man (some say his third, which would be same as Chu Shong tin, so I don't know which). Worked on the Police force in Foshan with Yip Man. Jiu Wan learned Wing Chun starting at the age of eight under Jiu Jow (his uncle) and also Chan Yu Min, son of Chan Wah Shun. Jiu Jow learned from Chan Wah Shun as well. Jiu Wan supposedly mastered The Chan Wah Shun method under these two students, whereas Ip Man (whose first teacher was Chan Wah Shun) did not due to Chan Wah Shun's death (Although he did finish the system under Chan Wah Shun's main disciple, Ng Chung Sow, Ip Man's elder kung fu brother). However, Ip Man also completed his training under Lung Bik, Lung Jan's son. And Jiu Wan later became Ip Man's disciple in part to learn these teachings. This likely indicates that Ip Man and Jiu Wan were the only two people to master both lineages.
More in-depth info here: https://www.ewingchun.com/wiki/jiu-wan
b. 1921 d. 1974