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This article about the restrictions on adoption in Canada and the United States during the 1950s was very illuminating. Apparently not only race, but also religion was controlled by adoption agencies. This led to a booming black market in babies.
One man remembered that his mother seemed to have a baby every year, and they would vanish shortly after birth. His mother raised a number of children on her own, but those she had with a man who was her lover tended to be taken away.
The discovery that her known children had more full and half brothers and sisters, came about via DNA results through ancestry and genome testing sites.
The man, by the way, was married and had a whole other family.
Amazing what greed will drive people to, isn't it?