Traildad,
Yes, you have been put into a terrible situation. You have been betrayed by the one who you trusted most. Add the fact that a level of incest is involved, and it is that much more repulsive.
When I first discovered my WW's betrayal, I became almost obsessive with keeping it unknown to the rest of the world. I made her swear not to tell anyone, and I was going to take this disgusting secret with me to my grave.
And although my children came first, the truth is that it was a myriad of reasons that I wanted to keep it under wraps.
Pride, vanity, embarrassment, humiliation.....all of these played a huge role in my not revealing to anyone. And add to the mix that I was painfully codependent and scared to lose what I had, and it added up to me never wanting to peep a word about this till the end of time.
Are any of these the reasons for your silence---besides the children? Because if so, then you are eventually going to let matters worsen.
I am not trying to sound like a jerk here...believe me. I just don't want you going down the wrong path that I did for so long.
You haven't put your foot down about her trip. Why not? And why the f@ck did she book this trip without your consent?
If you stay on this site for awhile(and I hope that you do), you will see that passiveness equates to more problems. While she is in the affair...which she is...all the stops need to be pulled to get results.
Shock and awe. Inflexible demands on your behalf. Absolute intolerance to her inappropriate behavior and boundary issues.
These are the things that will yield results.
Go to any of the forums here, and ask how the outcome resulted when the BS tried to tiptoe and outnice their affair partner. I will bet that you will find nothing more than a few voices to the vast---almost total---majority that will say otherwise. And there is a reason for that--the wayward mind is not operating like yours and mine at this time.
It took me 10 agonizing months to learn that lesson.
I know that you fear what lies ahead for your children, but you have been put in an extremely difficult position. The chances are better than not that this will eventually come out. Maybe not, but you have to accept the fact that YOU DID NOT PUT THEM IN THIS SITUATION.
And although you are the one who is protecting them at this point by your silence, you are allowing your WW and her POS cousin to strengthen their bond daily. That sucks. It sucks because you have been forced into this situation, without really knowing the correct way out.
So all I can do is advise you like I would any betrayed spouse whose partner is still in the affair---BLOW IT UP.
Let her know point blank that you would rather live without her than share her like you currently are. Don't threaten to expose---as a matter of fact, don't EVER make threats---make promises...promises that you will follow through on. Promise her that you will not let this relationship continue. Promise her that you will not be a doormat, and let her continue treating you like she currently is. And promise her that once you regain control of your life, and she no longer means the same to you as she does at this point, you will not stay in an environment like this.
Lawyer up. Separate finances. Learn what you can realistically expect from a divorce in your state. As scary as this shit is right now, the sooner that you face these fears, the better.
Be proactive. No one here is telling you to be irresponsible, but know that every minute that goes by makes this situation that much more difficult. I guarantee it.
Keep us posted. You have to believe us when we say that you can get through this.
You WILL get through this. But it is going to be a tough road ahead...no matter what the outcome. Your WW saw to that.
Good luck.