They certainly know about his family and his close friends.

He thinks that Olivia knows a great secret about him and his friends because her father discovered it many years ago.

"So, what do we know about our heathen Chinese friends?"

"I don't know about his friends," she said again as freezing rain clicked against glass.

She had been amazed at how little she seemed to know about her friends.

I doubt it, but what does one really know about one's friends?

You see, I know about your friends out there.

He may have known unmentionable things about all his friends.

Judy wished she knew a little more about Dan's friends.

Josie doesn't know much about the girl, anyway not about her friends and all that.