Like other people said, for you and your family's safety, just leave and forget about it. Also, even if safety wasn't an issue, how sure are you that some of your family members wouldn't face legal charges? They might be 100% innocent, but get implicated in the crime, and it might be hard to prove their innocence. You could end up bringing on yourself even more problems than you currently have.

If you are 100% sure none of your family will be dragged into the mess, then you should at least wait a hella long time after you leave to report it (a year plus even, and do it anonymously), otherwise it will be obvious it was someone in your family who reported and they might come for revenge.