I'm living with my wife/brother/friend etc. Can we buy accounts using different emails under the same IP address, or do we need to use a single user to avoid copy trading issues?

If you are trading with another person under the same IP you will need contact support@originfx.com via email to notify them of your situation, in order to prevent a copy trading breach. Failure to contact the team may result in a breach of your account if copy trading is found.