Gosh, I am worn out reading through these threads.
If you are for real, then I would think you should now back away from these threads, and deal with the links that people provided so you can get some support. You'll find trained people on those links who can help you, without the noise on these threads about whether you are telling the truth.
If you later need help / want to chat about other stuff in the future, come back to mumsnet on a different name.
Please log off these threads, go and talk to your daughter. Sit down and tell her you believe her. Tell her you love her, you are sorry, and that you will support her. Tell her you are there whenever she needs you.
I understand that in your head you're trying to reconcile the "she is saying she has been abused" with "but how could he do this" thoughts in your head. Regardless of whether you are struggling to accept he is capable of doing something, you MUST tell your daughter you believe her.
If you are not telling the truth, and this is research / fun for you, I feel very sad that you have opened old wounds for exisiting mumsnetters, and hope you feel ashamed.