No matter how much you want to protect your friend you must protect yourself. Tell them that you were never an informant for the police and tell them exactly what you know. If you lie under oath or plead the fifth it could be more trouble than it's worth especially if there are childeren involved. If you don't know anything then tell them exactly that. That you had no idea about anything you were an innocent bystander all you know is what the police and your friend had told you. And that to them is hearsay. Just make sure you absolutely don't make it worse for yourself. You aren't the one in trouble just remember that.

