I'm not sure what's wrong with that statement (I'm also not a native speaker). Please let me know how I could have worded it better.
(In my native language, Dutch, it's common to refer to people of mixed race as having "mixed blood". I can find similar statements made in English on Google)
(In my native language, Dutch, it's common to refer to people of mixed race as having "mixed blood". I can find similar statements made in English on Google)