Recently, I put in for a modification of child support. The non custodial parent will have to pay me more, however, I owe her arrears on a separate child support case (when I was the non custodial parent, for the same child) of over $30,000. I have offered to dismiss her child support obligation if she closes the arrears case. Can we come to our own agreement and what steps do we need to take to protect ourselves and to make it legal? She is concerned that even if we agree to this, once she closes her arrears, she can't reopen and has stated that I still have the right to go after her for child support. How can we set this up so she feels secure about this situation? Our child is 17 and will be graduating school after she's 18 years old.