are tigers cats

It all depends on how you classify a cat. Most places in the world will classify a cat as a creature that has retractable claws. This has created a strange set of circumstances in Germany I think it was. A Cheetah is usually classified as a cat. If you own a cheetah in Germany, it must be registered as a dog, because Cheetah's do not have retractable claws. Isn't that silly, nearly as bad as, are tomatoes a fruit or a vegetable? They are in fact a fruit, but for import taxes in England, they are a vegetable.

yes they are all cats. If you will look on the internet, tigers are called cats. They just grew up so big. THey have the same origin.

Actually, I think cats have an origin in tigers. Tigers are really just big cats.