I am praying that the relationship of mom, sis & OM can be healed. I am praying that OM breaks it off w/my W and talks to her about seeking a R w/me rather than going off and finding a R w/another OM.
I hope it works out for you, but be prepared that it can very well go the other way. People putting pressure on an affair couple to breakup can boomerang and commit them to being even closer as they fight against those that would deprive them of their assumed one shot at happiness. You're hoping for a lot of things to happen, and you'd be well advised to have no expectations. Things will work out the way they will, and not necessarily the way you have in mind.
What makes you believe that the OM is going to now emphasize you as the person your WAW should be in a relationship with?
some feel that it is a one-sided affair, a "school-girl crush".
They wouldn't really know. I doubt even that your W knows. Don't hang your hopes on what others may say.