I value my kids happiness and futures more than anything in the world, and my sister finding out will have a big impact on my kids and her kids lives.
As many times that you have made this statement, I assume this is your platform for not being proactive in your situation. I think I've asked once before, how do see the truth vs living a lie impact the lives of these children? Your previous answer was that they would not be able to see their cousins. That's not realistic, IMHO, unless someone moves away (which could happen even in good circumstances). As their father, you will have equal say (and if dvorced) equal parenting time. So, if you and your sister want your kids to see each other..........what would stop it?
Okay, so you are a loving father. As far as I know, every H on this forum feels the same way about his children. What I don't understand is.......what do you want from us? I mean is your MR doesn't stand a chance as long as your WW & BIL continue their A. So, are you asking for advice in how to proceed with living under the same roof with your WW, knowing the A continues and you have decided to quietly sit back and hope it dies out? Is your plan to stay with her, be a SAHD, and say no more about her A? This makes two A's in xxx amount of time. There will be more, if she gets what she wants and never suffers any consequences for her action.
I just want to know your intentions and what you are seeking from the board. I am not saying that sarcastically. It would help us to know your plan and how you want the board to help you.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!