:hi: Welcome to this forum! It's so nice to see someone asking such thoughtful (and respectful questions). I look forward to seeing more from you here!
What to call those with more than one ethnicity? It really depends. Unfortunately, our society still seems to carry the idea that if you have any aspect of black in your blood then one is black. However, those that are of more than one ethnicity are working to change that. Some that are biracial want the ability to be known as such and not just grouped into one race or the other.
I've heard Lenny Kravitz (who is of Jewish and black heritage)state he thinks of himself as a black or African American man, though he is biracial. He stated his mom (Roxie Roker), told him that yes he does have two ethnic heritages that are part of his cultural background. But she also told him that the world and society at large would see him as a black man, so that is what he needed to identify himself as. For him, this resonated and he never had any questions about his identity or who he was.
I've heard that in some hospitals, they won't allow parents to state their child is biracial or multi-ethnic, parents have to pick one thing or the other. There are groups that are working to change this, because they feel it is limiting and it works to continue to box us all in based on race. I personally feel such a thing would be positive for race relations in the grand scheme of things. When we can stop categorizing people based on race, we can stop looking at ethnicity as a label, a means to divide, etc.
The population of biracial and multi-ethnic individuals in our country is growing. As this segment of the population continues to grow it will become harder and harder to typify people as one thing or the other. The world is growing more brown day by day, as more people marry and procreate interracially. This serves as part of the reason for such anger from white supremist groups that get so pissy about racial mixing? They are scared shitless that eventually no one will know what anyone is--then no one will have any foundation for the argument of "superiority based on race."
Not like they have a leg to stand on now, (lol) but people like them need to keep things simple so they can feel better about themselves.
For more information about biracial or multiethnic families here's a link for you:
http://www.mavinfoundation.org/ :hi:
I hope this was helpful!