how come my brother receives my messages?

[allen]

the icloud keychain isn't even approved , my brother owns an icloud account for iphone and he receives everything like my facebook messages texts twitter he has access to everything on my phone how i tried unchecking his number on the setting but it didn't work he still receives my messages and is able to reply.
i mean he caused me a lot of trouble he texts my gf and also writes stupid stuff on my facebook. i need an absolute solution for this problem

i don't want to read his messages and i want to make it impossible for him to read mine

PLEASE HELP

[Artv]

All that has nothing to do with twitter or facebook.