@Lyrad3d14,
Good lord, I hardly know where to start.
Nothing productive is going to come from involving her parents. What does she imagine will happen? She'll get partners in abusing you, or something? It certainly looks as if she's assembling a team. But for what? She doesn't need a team to get a divorce, if that's what she wants. She just needs a lawyer and some cash to pay for one.
I'm not even so sure if, in the US (
you may not be in the US, so take this statement for what it's worth), if she would need this much corroboration to get you put on the sex offender list. And that would be the kind of revenge that would clearly come back to bite her, seeing as it would likely severely restrict your employment prospects for the remainder of your days.
I offer no excuses for your honeymoon behavior but I also offer none for hers since then. Your 15 year old (another son? daughter?)'s inclusion in all this is even worse. They're a minor, and this is all well beyond their pay grade.
Since this child is 15, I have to believe you have known your wife for at least 16 years. And
nothing led you to believe that she would behave this way, even under such circumstances?
I think talking to a counselor is generally a good idea, but I don't know what you want to save, or why you think it should be saved in the first place. You could each use counseling to work out your own roles in this sordid little drama. But to stay together? Personally, I would be continually wondering when the other shoe would be dropping again.
I also think it imparts a terrible lesson to your elder child, that if you're nasty and vindictive enough, you'll eventually get your way.
Life doesn't have to be this way.