Just try to keep the staff from knowing any details.

I haven't figured out how to have them inside and keep my family from knowing.

"If only I could keep from knowing these things about my father!"

He had gone out of his way to keep her from knowing.

Because whatever it was he needed kept him from knowing.

"Sometimes, it's as if you put up a screen to keep me from knowing anything."

"I did not play so bad, but she keeps you from knowing where the ball is going."

Not to listen, but to keep them from knowing I'd heard their private opinions of me.

Ian had to keep the Major from knowing just how strong he was.

I think that's the right thing to do, to keep anyone from knowing that something's wrong, at least for now.