brother of one's brother-in-law

例句：

1. 1.He is the brother of one's brother-in-law.
   他是某人的姐夫。
2. 2. I am the sister of one's brother-in-law.
   我是某人的姐夫。
3. 3. She is the sister of one's brother-in-law.
   她是某人的姐夫。