My grandmother was born in 1889 and adopted later that same year. We never had any idea who her biological parents were, and neither did she. I had my 96-year-old mother take the ancestry DNA test in August. Within 3 weeks of receiving her results, I had identified both of my grandmother’s biological parents, thanks to several 2nd and 3rd cousin matches.
So, if you have a similar family mystery, DNA testing is the way to go. It is also good for verifying your paper genealogical research.
You can take your ancestrydna raw results, and upload them to myheritage, familytreedna, and gedmatch, and get more matches. Gedmatch is the database that the cops have been using to help crack cold cases. They can’t access ancestry without a warrant, I’m not sure about myheritage and familytreedna.
The daughter is about 61 and a grandmother--for 40 years she had wondered who her birth mother was and was afraid she would never find her. Her mother not only got to meet the baby she had been pressured into giving up (the conception was because of a rape) but also grandchildren and great-grandchildren she had not known about.