I have seen lots of stories like this, as I am kind of addicted to a program called Long Lost Family. It is an English program that has run for a number of years, but there is an American version, and there was an Australian version for one season. The program acts on behalf of people who were adopted at birth or an early age, or parents forced to give up their children, but have wanted to find out that they have a good life. In the UK in the 50's, 60's and 70's, having a child out of wedlock was a family disgrace, and many parents refused to have their illegitimate grandchild brought up in the family, putting the mother in a mother and baby home till the child was born, then having it adopted.
Often these adopted babies grew up to be adults who looked nothing like their adoptive parents or siblings, and wondering where they came from. The program uses DNA databases and special intermediaries to trace their parents because the details of adopted children were usually changed and protected. It is very emotional when an adoptee is reunited with their birth mother or father, or when birth siblings who did not know about each other finally meet. Family is often located in other parts of the world. The most difficult ones are foundlings, who were dumped by their mother on doorsteps, phone boxes, even railway luggage racks. They have no record of where or when they were born, just a baby in a cardboard box or shopping bag.
The program airs on Channel 2 and is available on ABC Iview.