I have heard in many places if the other parent takes custody the state will not pursue TPR on the first parent so the custodial parent can still pursue child support.
If i were you I would not even broach the subject of adoption at this time, its very premature. Has there been a court hearing yet? Do you have a lawyer? Its not the workers who usually make the decision on what the goal is, it is the judge. Who has the other kids?