I didn't necessarily see her father and step-mother as forcing Quiara to choose, but I thought is was just plain wrong to have the conversation they did in front of her. They both behaved as her mother and her mother's family didn't exist- -they denied who she was- -and implied that she might be better if she did too. So force, no. Made it easier to choose, yes! And how sad that they could not see the value in celebrating both- -all of who she is.
I think this is typical of people who have a very tunnel vision view of life. They see only their existence and decide that everyone should live this way. All the while they are robbing themselves of the opportunity to grow and experience and creating unnecessary divisions based on their judgments and small world views.
My son is Mexican and Native American, on his father's side. He is white passing, so he has to deal with some of this- -sadly there are members of his own family who make derogatory remarks about Mexicans. He has been more effective standing up to his friends, who seemed to feel their demeaning comments would be embraced by all in the friend group. My son does not have a close relationship with his father, so he has had to learn many things on his own. My role has been to offer resources and love him for exactly the person he is.