A friend of my brother-in-law.

我姐夫的一个朋友。

youdao

I can't find her, so... See, I was supposed to meet her here. She is a friend of my brother-in-law.

我找不到她，所以……你看我和她约定在这里见面，她是我姐夫的朋友。

youdao

When I went with my second brother to Ahmedabad, some enthusiastic friend of mine took me by surprise by printing and publishing it and sending me a copy.

当我和二哥到艾哈迈达巴德的时候，我的一个热心的朋友出乎我的意料，把它印刷出版了，还寄了一本给我。

youdao

One day a priest, a friend of my brother Dan and his wife, stopped in to see him.

FORBES: Passing It On

My brother Brian was most of all a good friend.

CNN: [Brian Novotny]