Um, same anon as before. As >>450 said, she is blood, and that counts for a lot. However, we would probably have to leave my grandpa, who is blind and fragile, and would hardly survive the move let alone during a zombie apocalypse. My grandma, however, actually has a shot at surviving and is still pretty useful in her own right.
She's faily agile and sharp for her age, and she has several useful skills, such as gutting and cleaning game and fish, the creation and maitenance of fishing nets, survival and thrift in poor conditions, mending and sewing clothes, canning, and other useful skills that other people may not have.
The cat, on the other hand, is a dumbass, runs away from mice and falls off chairs. It's not going to be of any use to us.