I am looking for my ancestors (伍/ Ng) from Zhongshan

My name is Lázara Kuong Caballero (Ng Lai Yee).
My father 伍添勝 (Wu Tian Sheng / Ng Tim Sing) was from Chungshan (Zhongshan), Guangdong, China.
He was a merchant and he emigrated from China to Cuba in 1922.
In Cuba, he was also well known by the name ENRIQUE KUONG.
Some years ago, he and my mother Aleida Caballero Alvarez lived at Rafelito Km 33, Cumanayagua, Las Villas, Cuba.
He died in 1975.
I am looking for my brother 伍锦洪 (Wu Jin Hong / Ng Kam Hong).
In Hong Kong, he was also well known by the name John Ng.
He was living in Hong Kong some years ago and he was married with 陈翠英 (Chen Cui Ying) or Stella.
Their children are Robert, Peter and Maria. (伍罗拨 or Lou).
I am also looking for my aunt 伍焯珍 (Ng Cheuk Chun) and her family (Li Ming, Danny Li and her granddaughter Celina).
My aunt Ng Cheuk Chun moved from Hong Kong to Canada on October 23, 1976, and she was living at 3228 Adanac Street, Vancouver B.C., V5K 2P1, Canada. (Phone at that time: 604-254-4444).
The last time we received her news was in 1987.
Thank you for any information.
I really want to receive any news of my family.

Best Regards,
Lázara Kuong Caballero.