Tried early to sign both Tina &Lisa but was told that email was already used ?
Yes you need separate emails for each account. It's the way the software works I'm afraid.
If you want doll accounts, just ask me or Karlos to create them for you, they will have fake emails that you can change later into something that works if you wish. I have updated the rules above to reflect this. To create a doll account we just need their log in name, we'll leave you to fill in their personal details.