Have you searched your area for any counseling resources for your boys? There may be somewhere you can take them to take care of their emotional well-being. You may even be able to find a pastor at a local church-many can counsel and may do it for nothing. My kids dad has never really put any effort into getting my now 14 and 16 year old(he left 2 years ago). He is supposed to have them 6 nights a month and then whenever it works for them to get together. They have never spent the night and I can probaly count less that 20 times that he has actually come to get them and spend time with them. My kids have come to terms with it and have formed their own opinions about their dad. I felt like all I could do was support them, love them, and let them know that their dad loves them and shows it the best way he knows how and then let them make their own decisions about him. I know how difficult it is to never have a break, but hang in there and look for that help.