I don't see a reason why it won't be allowed.
The only info I could find in Terms and Conditions point 11. Obligations of the user
A user may not have several accounts for one game world simultaneously. However, the user is permitted to have one game account in several game worlds simultaneously. ArtCraft reserves the right to allow several game accounts per user for a game or individual game worlds. In this event, ArtCraft shall indicate this in an appropriate manner to the user. Accounts may not be sold, traded, gifted, or otherwise transferred at any time under any circumstances unless explicitly authorized by ArtCraft. A user may not share their account. A user may not disclose their password to anyone else.