Sounds like you have a solid plan. IMHO, I still agree with jujub about talking to social worker or family therapist to help you with how best to handle when S13 comes to you to talk. They may be able to give you advice about how to handle your very spiteful WW, too. Finally, it may help you in court if they know how much you really want to do what's best for the boys.
Anyway, I'm glad you have a strategy. And I'm very glad that S13 has you in his life. Just imagine if he didn't!
Remember - You didn't deserve this. No matter how many mistakes we all made, no one deserves to be kept away from their children. And the children shouldn't have to suffer any more either. ((Hugs))
M 44 H 46 M 20yrs T 25 yrs S15 S12
ILYBINILWY 7/18/15 Move to MBR 9/8/15 Physical Separation 10/10/15 Suspect A 8/2015 Confirm A 12/27/15 D filed by H 2/2/16