Find out who's around now, and then see which of them knew your father when.

I used to know her father and she's very private.

"I really got to know my father again and be a part of his life."

And then she thought, I never knew my father well.

I knew his father, but that is a story in itself.

For a moment, their eyes met, and he knew his father.

I never knew my father, or indeed who he was.

Child, I knew your father and mother long before you were born.

"It seems they did not know your father very well."

Perhaps she would get to know his wonderful father a little better.