Anita is Neil's wife. Neil is one of my friends. Now, how do I refer to Anita? Think that I'm telling someone who does not know the couple.
One of my friend's wife
One of my friends' wife
I know the structure
one of [something] takes a plural but then, here it is about possession of a singular which should be made plural--> "....friends' wife?" .
This is interesting. Suppose Neil has many wives. How do I again refer to Anita?
One of my friend's wives?
One of my friends' wives?