I am glad you have taken on my comments samsword - as I have doine yours, and I appreciate that you are very hurt and angry and feel as though some sort of revenge would make you feel better.
The revenge you are planning will not salve your pain - only time can do that, and in time, hopefully you will be glad that you did not take this action.
I understand your anger at this woman's parents, but you must know that it is misplaced, and they cannot be held responsible for the actions of their adult daughter - although they would feel so, even though there is nothing they can do.
I hope you will allow this rage to pass - and it will - and realise that the guilty party - your husband - is where your anger, and hopefully your healing, lies.