can you change your Change Your Displayed Name if you have multiple devices attached with the same apple id?

@ AmishCake I already looked that that and unless there is a specific one I am supposed to be looking at none of those addressed the question above.

@pdroth. Displayed name as in when you sign up for a apple id you sign up with email and a screen name(this is your display name). If you are using any apple device as like you do with an android device you have to sign in with either your google acct for android or apple id for a apple product. If one apple product is utilizing that apple id already aka Iphone and you can't set up a account for your child because of his or her age because of age restrictions, both devices will use the same info. So for instance when using things like facetime instead of seeing jane doe calling jane doe(basically making it show name of other person using your account instead of seeing your own name) can you make on jane doe and one john doe using the same apple id just different outgoing display name. Hopefully this helps.

That is the problem we don't want to use one of our email addresses as it mirror's our info in his device and he can't have his own email because of age restrictions

Ok now I understand what you are saying.