I believe his wife speak Cantonese mostly (https://en.wikipedia.org/wiki/Priscilla_Chan https://en.wikipedia.org/wiki/Priscilla_Chan), and Mark learnt Mandarin.

I believe his wife speak Cantonese mostly (https://en.wikipedia.org/wiki/Priscilla_Chan https://en.wikipedia.org/wiki/Priscilla_Chan), and Mark learnt Mandarin. https://www.youtube.com/watch?v=Y2fucDSilWE https://www.youtube.com/watch?v=Y2fucDSilWE. Even both are Chinese, but has huge difference in pronunciation.