You're assuming they're from Guangdong. (Canton) Chinese from all over sold children - including those in Singapore - and Shanghai was almost as big a trading port as Hong Kong, and had a greater international trade, especially American.
Puhtonghua (Mandarin) is the most common language in all of China. This show is set only 13 years away from the Chinese Republic, 3 years from the Boxer Rebellion, and it was the Qin Empire 2200 years prior to this that started the unification of language.
Unless specifically from Canton, many Chinese spoke their local dialect AND Mandarin.
..Joe
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