Boss,
We are going through something of the same nature at the moment. As for the misdemeanor crap, it shouldn't be an issue. Unless it's some form of abuse or neglect towards a child, or something that will endager a child it will probably not be looked at. If it's that old as well they might not even be able to bring it up, but that depends on the courts and the judge.
You will probably need to do what we just did last night and get several people to right letters stating that it's in the best interest for the children to go to you. Statements about how much you are in their lives and how much they need to stay in the family.
The courts are big on keeping children in the family if they feel it won't endanger the child/ren.
Keep the chin up and we will be praying for you