I’ve heard that mixed ethnicity children are discriminated against in Asian countries such as Vietnam. Just an observation, that this man may have set up his children for difficult lives in such a society.
As the father of an Amerasian child, I’ll have you know that rule varies from country to country. What you said about discrimination in Vietnam is true, but on the other hand, in Thailand and the Philippines, having mixed ancestry is a plus, thanks to the influence of Hollywood. Most Filipino actors and singers fall into the “Mestizo” category.