I feel for you RGM! I wish your W could see what a mother's greatest achievement is ... children who are happy. Perhaps she lost or never had her own identity. Sounds like she defines herself according to what her father and brothers told her. That must be pretty hard, and to lose one's mother at a young age, isn't fun either. I hope she finds herself before she does much more damage to your kids. Children are resilient to a point, but why should they have to be. Why can't they just have a wonderful, stress free childhood? That would be the greatest gift she could give your boys, considering the crappy one she had.
However, she is an adult with the responsibilities of motherhood, and she chose to have your S's, and so there are no excuses for her detachment from them. Except, of course, if she is depressed or going through MLC, which it sounds she is. No normal mother would act the way she is acting, unless there were some mental issues.
Only advice I can give, is be patient, think about what you want, and consider what's best for your S's. Try and detach from her craziness, and remember the true person she is, and could be. Cut her some slack, but don't be a doormat either. Not easy, as you know.
Take care.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim