You will never know who you are, unless you understand who we and they are, as well as who he, she and it is.
True knowledge is beyond personal pronouns.
Personal pronouns give shape to the perception of a separate reality.
As long as you keep your sense of identification confined within the arbitrary limits of personal pronouns, all the knowledge you get will be dominated by those limits.
All the knowledge you can get by knowing thyself is the knowledge of your separate identity, the knowledge of an autistic world.
The ancient aphorism “know thysef” is the most refined motto of the ego.
Know thyself is a fraud.
Hence if you truly intend to know.