What is a Chair?

There is something about a chair that makes it a chair. A Chair is more than a thing in which to seat and recline. It is more than just function. A small chair that would collapse when I sat on it would still be a chair for a small child. I would think that even a small little dollhouse size chair is still a chair. There is something about a chair that makes it a chair.

If a chair breaks its leg: is it still a chair? There are some who would say it is no longer a chair. Others would say it is a chair; and because we regard it as a chair we should also regard a stool as a chair.

1) A stool is a chair because we would continue to regard a broken chair as a chair. 2) A broken chair is not a chair. If you disagree with both of these statements, you may be a right wing, conservative, nut job, and only driven by your religious convictions.
What is a person?