We haven't met, but I'm a friend of your sister's from back in Phoenix.

I am also a friend of your sister Althea.

She met a couple of friends of her sister, who informed her about two girls waiting outside the store.

I'll introduce you as a member of the company and a friend of her sister.

He dearly loves Jayasudha, a friend of his sister and also works in his office.

She is a friend of Ganesan's sister who comes on a vacation to the village.

You were a friend of my older sister, weren't you.

And as I said, unfortunately, they're all friends of my sister and her husband.

In December 2006 a close friend of his sister Beatrice committed suicide.

"But seeing as you're a friend of my sister's, I'm going to tell you a big secret."