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The 4F's: Friendship, Freedom, Fun, and Fair-Play
I know a family of three with an account each (the Mother only plays Perfect world I think)
I don't think there's a rule against it in general, but the OP is probably better off getting an an official answer from PWE if he's worried about it. Neither of us is official.
I did see a rule that says people aren't allowed to create new accounts to circumvent suspensions and bans, so I can point to that. But it doesn't answer the original question.
Volunteer Community Moderator for the Star Trek Online forums -- My views may not represent those of Cryptic Studios or Perfect World Entertainment. If you wish to speak to someone on the community team, file a "forums and website" support ticket here, as we are not able to respond to PMs regarding moderation inquiries.
The 4F's: Friendship, Freedom, Fun, and Fair-Play