Could be he's mad at his wife...
I doubt that she is his wife. There is a certain uncouth type of man who would have sex before marriage.
This link was posted a while ago. She isn't his wife; she is his live-in girlfriend, if I recall correctly. I was struck by the fact that they "discovered" the child is not his child. Makes it sound like this lack of paternity just suddenly and spontaneously occurred, doesn't it? I'd say the mother probably had something to do with it, though!