Do not have your sister make an account and post, or you will be banned for alternate accounts and cheating. There is no way for us to determine if the account really is your sister or if it's just you making multiple accounts. And if we allow people to make alternate accounts and use those alt accounts to post and vote in CAP, then we will open the door to rampant cheating. In this case, there is no alternative for you and your sister. We have been down this road in CAP in the past, and there is no way around it.