She doesn't know about her mother for sure, yet.

I don't know about the creep's mother, but what he did is absolutely killing his father.

"I suppose there are things a man does not want to know about his mother."

I know more about your mother than you do, thought Bean.

Little is known about her mother other than she was a very religious woman.

The only thing known about his mother is that she was a Toblakai.

The only thing he knew for certain about his mother was that he'd never known her.

"I would like to know about your mother," Alan said simply.

They didn't know about his mother, and that was a tremendous relief.

Look, I just needed to know more about my mother.