I enjoyed the programme but there was one thing with the bearded man that niggled me.
He spoke positively of the man who brought him up, who he had thought was his father. Well, I understand that some people (not all) want to find out who their genetic parent is if they find out it's not who they thought; but after his news, he looked so lost. I wanted to say to him, Hey, don't forget the man who actually brought you up and was a father to you! He may not have been genetically related but you are the person you are thanks at least in part to him!
I hope and imagine that participants in the programme are suitably counselled about this sort of thing.