Re: My sister wants to marry...
Why not?
He's a Muslim and that's all that should matter.
We sometimes get a bit carried away with our sentimental attachments to our ethnicities but these things are only regional culture and traditions, it's only Islam which really matters, all other identities are temporal and useless in the next everlasting world.
You're lucky she's chose a Believer, I've seen Paki girls with Hindu guys and even though they're the same ethnicity and I respect all people but I think it's still really sad when a Muslimah goes for a life of fornication with a Disbeliever, but the guy in question here is a brother so go for it and make him a part of your family, it's pretty hard for most reverts as their own families are not always very supportive.
I think a Muslim person of Paki descent born in the West can relate more to a Caucasian Muslim born and raised in the same enviroment than a imported Pakistan born person, there's more of a cultural gap with the latter because second/third generation Pakis don't have a true understanding of the real Paki culture 'imports' grew up with.
I've met one White lad and two Black lads who were reverts to Islam, and except for skin colour I saw no difference between us and them.