(((((Tishie)))))

What choice do you have really? If the teen is like my own kids, he/she'll not listen to reason, or think that they can handle it on their own. I've tried to explain to my kids that the very thing that you think that you can't tell me is exactly what you NEED to share.

As a parent I think the only logical thing to do is contact the parent of the child involved. The kid will probably be angry, but safety is more important than anything else.

If the allegation is true, the elder person involved needs to be dealt with by the authorities, if it is an exaggeration or misunderstanding, the elder person is entitled to know that there is a problem with that particular friendship.

I am so sorry that you've been placed in this position. But imo you have no choice, you have to tell the parents!