BRNR, this is just so selfish of your H to do this to the boys. Can you set the boundary there? This OW is practically a stranger to your boys. No wonder they don’t feel comfortable with her. I don’t have small children, so I cannot give you any meaningful advice about it. I’m here to offer you some support.
M:50 H:52 S28 (my S from previous marriage) M:17 + 3 BD: 06/12 S: 06/12 - H works in another state