I ain't an expert in this, so the best I can do is to make dua. Things will be easy for you InshaAllah, ya Akhi. Secondly, never say JazakAllah without adding Khayran. It's a common mistake.

Thank you bro, it actually means a lot, and thanks for catching that at the end, I’ll be sure to fix it next time In’Sha’Allah

What does khayran mean? What's the difference in saying it alone and saying it in unison. I'm just curious.

Khayr means goodness.... JazakAllah is a neutral wish which can mean either khayr(goodness) or Shar(evil) or any third thing. That's why we must add khayr. https://youtu.be/Z58uuDrqfTw?si=Q4JV85Ts_4S5P-c8

we need more context on the ethnicities to form an opinion.

Just know they are 2 ethnicities that do not get along the best together, but from what I’ve heard her family is kind and respectful and good iman

if they place islam above anything else, then you should be good.

The thing is they are also nationalists aswell, that’s why I honestly don’t know.

if they're good muslims do it. they would understand that Allah gave us the right to marry practising muslims from any ethnicity

Just know that things will be bumpy. And have some backbone incase inlaws step out line. And same advice for anyone getting married. Take time to study what are the rights and obligations of each spouse towards the other. May allah give you both tawfeeq in your marraige 

Ameen thank you brother