One of my grandmothers hated cats. If they were inside, outside cats were okay. Learned a lot of "old country" superstitions about cats from her. For instance:
They'll steal the breath away from a child. Yep, if your child is too close to one, they could suffocate and die. I think this stems from the fact that babies are usually warm, and cats like warm things so to a cat it's natural to cuddle up to a baby. It wouldn't be aware that it was covering something like a mouth or a nose.
Cats are awful luck to have inside, unless someone is sick. For some reason they're good to have around sick people - maybe because if they can steal the breath, they'll steal the sick breath away and the person will get better? Who knows. But if anyone in the house was sick, a cat was brought in from the barn to stay in the room. In the meantime I'm thinking Oh sure, fleas are really gonna help...