Grace-
After some digging, I found the paper I was referring to. It is the Consent to Adoption/TPO "By parent that is not the Stepparent's Spouse". (meaning the bio-father giving up rights)
The exact wording of #7 is as follows:
That I understand that when the adoption is final, the legal relation of parent and child between adoptee and me will be terminated, including all rights of the adoptee to inherit as a child from and through me, and that the adoption will extinguish any court order of custody, visitation or communication with the adoptee, except that I will remain liable for past due child support payments, unless legally released from this obligation.
My attorney wrote up the waiver releasing him of the support, but he never signed it. I realize this was not a basic TPO, the adoption was attached to it, so maybe it made the difference. But I recall before I even met my now-husband that my attorney told me the TPO would terminate support obligation, and I would have a hard time getting a judge to agree to it.
Hope this helps.