"I tell you, he had nothing to do with what happened to your sister!"

Neither had any such disturbing thing happened to my sister five years earlier.

He did not know what had happened to his sister, Kim, a senior.

I have to know what's going to happen to my sister!

I've got to find out what happened to my sister.

"Do you suppose anything of the kind has been happening to my sister?"

You're going to tell me the truth about what happened to my sister.

That's when everyone tells you what happened to her sister.

"But I would be most upset if anything happened to my sister and her children."

If anything bad had happened to your sister last night, I'd never forgive myself.