That is an excellent point. I have many second and third generation friends who's grandparents, and even parents have only assimilated local culture when absolutely necessary. Their children however are as 'home grown' as you like, to the point where most laugh at their for-bearers (reverse?) xenophobic behavior. This is a phenomenon not exclusive to people from the far east either. The same can be said for many families I know from eastern Europe and the Middle East.