Voluntary TPR - how does that work?

Here in Texas, the caseworker can talk to the parents (with the consent of the parent's attorney) about relinquishing their rights, or the attorney can do it themselves. If they agree, then they draw up the paperwork (I forgot what it's called here) and the parents sign. Then the paperwork is presented at the Merits (TPR) hearing.My FD's parents and my AD's father all relinquished. They didn't ask for any contact -- just some current photos. Here, CPS can't promise them contact after the adoption as part of the relinquishment agreement. However CPS can agree that they will give the adoptive parents the parents' contact info and suggest maintaining contact.