Help With iMessage and Apple accounts.

hi there.
have 1 apple account, app, music, , other content purchases. however, other family members started idevices, set them same account share our app purchases; seemed silly family of 4 should have repurchase apps , content on different accounts. however, release of ios 5 have encountered problems. imessage, facetime, , believe other apple services, tied 1 account. means in family can't imessage each other, nor receive separate imessages others. how go fixing this? if make separate account, possible still share itunes purchased cotent?
appreciated

 

you can have different accounts itunes/app store , else.

 

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