I think when dealing with your cousin on these issues with the business you should do so with a lawyer. Don't confront her on your own. Plus, since she is using company funding for something like this trip, and then also consorting with the customers, depending on your business type that could also bring up legal trouble. Heck, it could just bring up trouble. "She claimed as long as I slept with her (fill in the blanks.)" Or if other customers get wind of it they could cause trouble, too, even if not legal then in the form of rumors or bad talking the business to other potential customers. Nothing is worse than bad word-of-mouth. (Sure they are great if you sleep with the CEO type of BS....)

So... no, do not confront her on your own without an attorney present. And her "boyfriend" should not be involved, esepcially since he is a customer as well...

I feel horrible for her husband. That would be a nightmare to first overcome one infidelity only to relive it again a few months later. And then, what worse, to see your kids losing their parent... I will keep you and all your family in my thoughts, Blue.