No. Each person should have their own account. In particular, it's forbidden for more than one person to use the same account in the Playzone.
Please also note that it's your responsibility to prevent other people from using your account. Our Terms and Conditions state:
6.3. If another person accesses your Account, you are solely responsible for all their actions whether or not their access was authorised by you and you hereby indemnify us and hold us harmless against all costs, claims, expenses and damages arising in connection with the use of or access to your Account by any third party.