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Approximately 1/3 of the cases of hemophilia are results of random mutations at the time of conception. Thus it is really not that uncommon for two people with completely standard genetics to have a child with hemophilia.

Another possibility is that the mother was a carrier and didn't know. Since Hemophilia is due to a mutation on the X chromosome and females have two X chromosomes, it is possible for her to have no signs or reason to believe that she is a carrier. Even in cases with no family history prior, the spontaneous mutation can effect one of the mother's X chromosomes and then get passed on without her knowing she was a carrier.

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