"It was about a father who uses his son in a particularly evil way," he said.

You can't just use my son that way and expect me to cooperate.

I mean to use your second son as well.

Diana uses Paul's son and stepson to help her plan along.

"So, you want to use my son for window dressing?"

How could he use their own son to provide his cover, she wondered?

We can see how you used your son, so adeptly pointed out by @icantbelieveit.

"You're using your own son as a carrot on a stick."

But she recalled a father who had used his son to spy on a king.

Of course, that didn't mean Rod couldn't blame her for trying to use his son.