They simply don't work. Adding ethnic and cultural friction to the mixture makes it explosive. I have since lived in 11 countries. This is how I see them, of course, not how they really are. But it is too much to ask such different people to co-exist.
Culture shock leads to narcissism.
These narcissists will instruct, order, or threaten their children into hiding the truth of abuse, malfunction, maladaptation, fear, pervasive sadness, violence, mutual hatred and mutual repulsion which are the hallmarks of the narcissistic family. The whole family conforms to the fantastic, grandiose, perfect and superior narrative invented by the narcissist. The family becomes an extension of the False Self. This is an integral function of the sources of Secondary Narcissistic Supply. Criticizing, disagreeing or exposing the lie, penetrating the facade, calling the fiction by its proper name - are considered to be mortal sins.