Infertile Males. Name of that disease?

Hi, I have 3 quick question for my script (as I want the plot to be factual) and would very much appreciate your answers. In the script, the wife hides the fact that her husband isn't the father of her daughter (17) because Blood Types: O + A = Impossible. Could she hide it? (Logically) Question 1: If two parents of a child give their blood to the child (Wife O, Husband A) and the doctors see that the child is O as well, then would they only get the blood from the wife? Would they also tell the husband that the child isn't his? Wouldn't the doctors tell the parents that their blood types don't match the child's blood type during pregnancy or after the child is born? Question 2: After a husband and wife do fertility tests, are the results typed on a piece of paper? In such case, would the fertility test's results say Negative or Positive for an infertile person? Question 3: Can a man be fully infertile (at any time and without a cure)? And what would be the name of that disease?