A person who is born from one of the parents who has wizard blood is called mixed blood. Some mixed-blood inherent magical abilities, but some don't. One example is my father, who was born to a grandfather who was a human, and my grandmother who turned out to be of mixed blood.
'Surprised?' Me too. I always thought that grandma was purebred, but in reality, she wasn't. 'Then, what about my status?' I was of mixed blood, just like my father. The wizard blood of my great grandfather was with me, although I had not inherited any abilities from him.