Out SFDC org has both B-to-B and B-to-C business models.  We have enabled Person Accounts.  Now we are going to service Person Accounts on behalf of our Business Accounts. What would be the best approach to relate multiple Person Accounts with a single Business Account?  Use the Partners related list, or maybe create a new Master-Detail or Lookup relationship field?  What would be best practice for this?  Example, our client is a Credit Union (CU) and the Person Accounts will be the CU's members. We will sell services to the CU's members as though we are the CU itself.  We want to track Campaigns that involve the Person Accounts but also relate multiple Campaigns to the CU account record for reporting purposes.