choco good luck. My dp overhead a conversation a long time ago between his parents & got the gist that he has an older half sister! He plucked up the courage to ask his mum today & she confirmed that she had a baby girl when she was 16, but she was took off her when she was a week old 
DP mentioned about looking for her, but MIL said no, she's too scared to know.
It must have been awful, I really feel sorry for her & what a horrendous time it must have been...
Sorry, completely derailed the thread, I do love this programme, I find it so fascinating.