Who is XXX's sister?
Kung Yan-sum
Dr. Kung Yan-sum, (simplified Chinese: 龚仁心; traditional Chinese: 龔仁心; pinyin: Gōng Rénxīn; Jyutping: Kung1 Yan4 Sum1; born in 1943 in Shanghai), is the younger brother of Nina Wang Kung Yu-sum, the former Asia's richest woman and the late chairman of Chinachem Group, one of the biggest privately held property developer in Hong Kong.
Nina Wang