Eric, as you say, what goes around comes around. And/Or Vengence is mine, sayeth the Lord. I think you are a very special parent, and your kids are lucky to have you, and are just beginning to know it as adults.
I know there are things in my past that I would never be comfortable admitting/discussing with my children, even if it happened before they were born. Having to face the truth while still in an MLC - OMG. I believe that like other facets of MLC, they will peep out of the tunnel for only a moment or two, and then run back in to hide behind the lies. Your sons may not make it so easy this time. I'm sorry your sons had to go through it, but happy that they know the truth in regard to their remarkable Dad.
