D. J
Firstly, I agree you did the right thing taking your children out of the situation you were in. Congrats on staying clean, now comes the hard part. You probably will never understand where your sons thoughts are at this time. The system can hurt children and hurt any trust they have in their parents. This was not done by you, it was done by the system. REMEMBER no parent is perfect, no matter how much you try. I don't know any parent that is perfect, not even me. My sister used to call herself a "professional mom" and her behavior was that she felt she was the perfect parent, boy was she wrong! I told her this myself. Since no parent will ever be perfect nor will they ever make a mistake.
The system damaged my relationship with my children as well, and it was my husband's actions that caused them to be placed in the system. When the children were returned to me I had to fight, and still fight for them to keep in touch. My children are now grown and have families of their own, but they do remember many lessons they learned before the system.
Good people will be persecuted when the system has influenced children at any age. Don't let this change your successful course to stay sober. Your son(s) will change their mind, but they will have to see for themselves that you have made great changes in your personal life.
Spending as much time as you can with them now is a good direction for you and your boys. They may be happy where they are, but you need to get the boys home to live with you and learn how to live with what you can give them. You can give them your love, understanding, and patience. Sometimes when the living is easier children want to stay where they don't have to go through hardship such as not having enough money, clothes that are in style, and such. Don't let this deter you from taking charge even though the boys may be temporarily upset, they will adjust.
My prayers are with you as I do know very well the heartache you are going through right now. I have been there done that, but this behavior from your children will not just go away even after they get old enough to have their own families. You will be faced with this for a very long time. I am truly sorry you have had to deal with this, but I can only reassure you, that you did the right thing taking your children out of harms way. Now seek counseling as a family to help the children.