I had a cat who was raised with an older cat from the time he was a kitten. The older cat did not even like him much--they had a relationship of hissing and swatting at each when they passed one...
Meowing is mostly a cat to human thing.
Unlike humans who can speak cats have to use a variety of sound, scent and body language in communication. Wither the other cat is friend or foe.
Body...