Damn bro I'm sorry about that. So your mom is german? This is a big issue with all this passport bro crap and race mixing. You end up splitting your kids culture and race and they aren't fitting in anywhere really. I have similar situations in my extended family and its a contentious issue everywhere.
If it's any consolation even Hitler identifies that the first half generation is often able to identify these issues and actually protect the original culture because they understand what is special about the host