My partner and I advertised for a donor nearly 18 years ago and thought we had struck really lucky when we found the best guy ever. Fast forward 16 years and we discovered that not only did he lie to us about his heritage but he took ten years off his age. We now realise that he fabricated his heritage and our kids missed out on knowing about their true identities. We are very careful people but so amazing with his deception was he, that we had absolutely no idea that he had lied. I actually think that he had been very hurt by his own upbringing, that he consciously decided to turn his back on it. His own family were the ones who eventually let it slip where he was born and raised and we felt really stupid not to have known and also duped by them too, people who knew that he fabricated his existence but didn't tell us. I took it really badly because when we decided upon him as our donor, we took him to be truthful. He has had a lot to do with the kids growing up and I felt that I'd found a great family for the kids. Now the kids are teenagers and feel strongly that their dad has let them down. They've had to catch up on their real culture and feel behind the game. I am really angry and our relationship has become so tense because despite all the evidence (DNA tests/birth certificates/family members stating that he made it all up) he still holds on to his fabrication. Any thoughts ?.