There isn't really any "help". If you are the non-custodial parent, and the custodial parent is a taxpayer (either singly or jointly with a new spouse) then you can't claim the children as dependents unless the custodial parent gives you a signed form 8332. And if you did get an 8332 form for 2015, it wouldn't be valid in 2016 unless it specified a range of years -- normally they are good for one year at a time.
If you are obliged to pay child support, the dependent issue is something you would have to take up with the family court. The court can order the other parent to sign the form or face contempt charges, or the court could reduce your support obligation in lieu of sharing the dependents from year to year.
