He was the only father who ever came to our primary school football matches.

In spite of everything, he was the only father she had.

I remember him because he was the only father who ever came.

Max wouldn't be able to live with himself if he let down the only father he'd ever know.

They were the only father and son to serve simultaneously in the Senate.

But he lost his wife shortly after; and a year or two ago, the sea had taken him, the only father she knew.

It was her final offering to the only father she knew.

After all, he was the only father we ever knew.

He was the only father you've ever known, so it isn't a crime to refer to him that way!

Did she recognize that when they went to the park, he was often the only other father in attendance?