YOu may watn to keep collecting INTEL for a few mroe days and hold off on the move.. your call tehre..
You can always contact OWM again and tell her that your H is having sex with her daughter and he's married... she will very likley tell you the same thing as last time...
I don't know if you can record her voice without her permission though...
You could get her to say it and they say "I am recording this conversation for legal reasons, do you mind repeating that?"