Sue, how are your parents doing mental health-wise? Does your mother speak up and voice her opinion? Does she express to your father that she wants the dogs to visit? If possible, I would try to not get in the middle and see if the two of them can work it out. It seems unfair to deprive your mother of something she loves. I don't see where a dog puts her at greater risk of infection. Could you speak to her doctor about this? Perhaps your father would be convinced that a dog is safe. I actually think it would be beneficial for your Mom to see the dogs.
Natty Boh 6-27-12
Annie 1998 - 8-2-12 RIP