Sorry for the threadjack - my bad.
On another (or actually, the true) note: I once was in a training school with an Indian friend whose brother was marrying their first cousin. She said that it was ok for them to marry, because her brother was not their cousin's "cousin-brother", meaning, he wasn't the son of one of her father's siblings. She was the daughter of my friend's mother's sister (I think). It appears that it would have been taboo if the groom were the son of one man and the bride the daughter of that man's brother/sister....
Not sure - if anyone is of Indian descent and can explain it to us, we'd be grateful. I tried to google it, but got no where.