does going to the itunes store app to sign out also sign you out of your icloud account? I have an iPhone 4 with an IOS all the way up to date and I got it from my older brother as a birthday present. He moved to college and isn't in contact. I have my own Apple I'd and thought about using it but I don't want to go to the iTunes app and sign out of his account from the bottom where the balance is shown because I don't want it to be signed in but asking for the old password. What should I do? 

Also will that sign me out of his cloud account? I have a broken iPhone and want to get the stuff off of my cloud account
if you sign out of iTunes / App Store, than won't disconnect you from iCloud and vise versa