I never know him, let alone his family.

我从不认识他，更别提他的家人了。

youdao

"You would never know to look at him that he has spina bifida, " his mother said.

CNN: Study: Major benefits for spina bifida surgery in the womb

None of his players get a chance to overpower him you and never know if you're going to be in the team or not.

BBC: Everton ready to win Cup - Moyes

And they would never miss the chance to let him know that.

ECONOMIST: In search of the real Camus