Margaret Shen
Appearance(s):  Sleeping Dogs
Full name:  Margaret Shen
Gender:  Female
Family:  Wei Shen (son)
Mimi Shen (daughter)

Margaret Shen was the mother of Sleeping Dogs protagonist Wei Shen and his sister Mimi. When Wei was 10, they moved from Hong Kong to San Francisco as an attempt to get Mimi out of the drug habit Sam Lin got her into. Mimi couldn't overcome her drug habits and ultimately died of a drug overdose from the drugs Ming Ming Trin gave her. With the death of her daughter, this lead to her ultimately killing herself. 

It is rumoured that her daughter's death was caused by the Sun On Yee. Her son was later tasked with taking down the Sun On Yee from the inside in 2012.