What makes you think that these kids know who their real parents are. Or that they even want to go back home to such a strange lifestyle like normal. To many of them that would be just TOO weird to live like that.
Remember the Johnny Gosch kidnapping? He was eventually found in DC as an adult working as a male prostitute and content with his life. He had a new name and claimed that he was not Johnny Gosch and had no desire to ever see his former parents.
These kids have likely all had one or more iterations of some kind of mind control technology applied to them, not to mention torture and abuse. They are NOT YOURS to push around. Now, finally, they are free and they are going to live their life, and not live out your fantasy. Not even if you are a relative.
We will never see most of these kids again. Because they want to live their own life in peace, not as guinea pigs to a media spectacle.