Actually from what I gather it is quite easy [sometimes] to adopt and a birthparent never even know. This is particularly true with birth fathers. In our adoption case (with my now adopted son) the absent birth parent was willing to sign and so it was quite easy. I have heard of many cases though in my research down the adoption path where the adoptive parents did searches with the OAG, DMV (as mentioned), used paid internet investigator searches, and even hired PI's then presented the evidence to the court and had the TPR signed. The truth is that none of those routes yield astounding results necessarily. I don't agree that the birth parents (the fathers in particular because these are the ones that it usually happens to) are being treated fairly but it does happen. Hmm, I guess they aren't really being treated badly they are just not being found. Maybe they don't even know? And, of course the cases I'm aware of are dealing primarily with step-adoption because this is what I'm familiar with being that it was my situation. Judges are far more leniant in these cases I imagine because at least one biological parent is present. I don't know for sure but it would be my guess.
Once the child has met these eligibility requirements they will be placed for adoption by their natural parent or parents. Subsequently, the adoptive parent or parents, legal guardian, a licensed child-placing agency, or the Department of Protective and Regulatory Services, Texas adoptions will then go through a number of steps. The steps for a legal adoption in Dallas, Texas generally go as follows:
The finalization hearing, sometimes held in the judge's chambers, usually lasts less than an hour, and is attended by the adoptive parents, the child, the family's attorney, and a social worker from the child's agency. The judge may review the family's homestudy, ask questions, and generally attempt to ensure that the child is being placed in a safe, loving home.
The laws of the state in which the child was adopted determine who has access to the original birth certificate or other adoption records, and whether those records are sealed (unavailable). For information about the law in each of the 50 states and the District of Columbia, see the: http://www.childwelfare.gov/adoption/. This links to the Child Welfare Information League’s numerous publications on the legal aspects of adoption.
In MO, where I live the legal age of adulthood is 17. Some states it is 17, some 18. If I were you I would check into that. If legal age in your state is 17, I would just wait a few months and do an adult adoption. Then you would not need anyone's consent other than yours, your husband's and your (now adult) daughter. Then you could complete your adoption without stirring up a hornets nest, although if your daughter is interested in meeting her birthparents....this would be the perfect opportunity to make that happen.
Now if you wish to go it alone, there are ways to do so. One such way is to utilize the services of a Do-it-yourself adoption service such as RapidAdoption.com. For a reasonable fee, the fine folks at RapidAdoption.com will complete all of the necessary paperwork for the adoption in your state. They will even do it if the child is in a different state than you. They have been doing legal paperwork since 1998 and have prepared 1000’s of legal documents in all 50 states. But their service is only available in the United States and only with domestic adoptions. So if you reside outside of the United States or are adopting from another country, then this is not an option for you.