DCFS's "temporary" custody can easily exceed six months, and "they" still call it temporary. You'll need to provide more details on your specific situation so someone can hopefully provide you a useful response. We don't even know if you're divorced, going through divorce, living apart from the other parent, or just a single parent that has never been married. You need to provide details for people to work with.
Basically, what a court orders when it comes to dependents doesn't matter to the IRS and the IRS is not bound by such court orders. They IRS has their own rules when it comes to dependents - especially for separated or divorced parents. They are rather complex. So that someone doesn't need to spend an inordinate amount of time writing a book to cover every possible situation that could be your situation, it's best and a real time saver for all concerned if you just provide the details up front.
