Is He Wrong to Ban His Brother’s Indian Girlfriend From Coming to His Wedding?

Ugh. This guy

Title sounds very bad and horribly racist, but let me clarify:

So my brother (He’s 25) has been dating an American-born girl to indian parents since last year (She’s 23). Her parents do not like their relationship because he’s White and probably prefer her to find an indian man.

He has been trying to gain their approval but failing and from what he said, they continue to shrug him off and actively exclude him if she tries to bring him to her family events.