But if investigated, how long could he keep his parents and his sister out of it?

She tried desperately to keep her sister on the phone.

"Why didn't you keep your sister from wandering off andgetting into mischief?"

But he was proud that he'd managed to keep his sister somewhat fed and more or less virgin.

Didst think you could keep your big sister from this?

Keep my eager sister waiting and she'll likely take up with some passing stray Arab.

All the more reason to keep his sister out of the dragon's grasp.

Love had kept his sister emotionally and psychologically chained to their mother.

It sounds like you took a licking and got robbed to keep your sister from being raped.

"And to keep your sister away from me."