"That his real mother died of cancer a few years ago."
Our real mother just stayed in her room all the time.
He has just learned that one of them is his real mother.
By the time she learned of this, her real mother had died.
She was no mother to him because she'd taken his real mother's place.
Children need a real mother, tell them what to do.
I doubt whether you have ever known what your real mother's name was.
The real mother shows up and wants her kids back.
Maybe my real mother has been dead all these years.
The boy's real mother sat in court for many of the details.