um, I didn't say they are always in the head, I said often, big difference in my mind, I do know allergies can be serious. I have a couple of friends with serious peanut allergies, none have moved into a house beside a peanut farm/factory though, as they have a bit of common sense. I was talking about my own experiences not yours,Try reading again.
I made the assumption that someone with such a serious allergy wouldn't knowingly move right beside a long haired cat, and by the sounds of it asking a couple of neighbours or just being around the area for a little while would have identified there were cats around.