In the 50s the psychiatrics who worked with schizophrenic patients observed that the therapy had better results when other family members were involved in the treatment.
In the context of bicultural families the family therapy is an opportunity to visualize the unspoken conflicts through methods like the family constellations. All family members will be treated as equals independent of their gender and status.
During the therapy all family members will have the opportunity to talk about their perspective regarding conflicts, how they are maintained and how they influence the dynamic in the family. Methods and therapeutic tools like circular questions will reveal the complexity and diversity of the symptoms. When the family dynamic is revealed all family members will have the chance to change their behavior, which in turn change the behavior of the others.
I recommend working with the genogram when the identity of the family, due to the different cultural background of the parents, should be strengthened.