ArmouredWizard, ...and I've run into the same problem I hit before...
I have 3 Entities (Scoundrels, Crews, Contacts)
I have "Scoundrel with Crew" working (Each scoundrel is in exactly 1 Crew. A Crew can have 0+ Scoundrels)
I need to add Contacts. Each Contact can be known to many Scoundrels, and Many Crews.
Each Contact also has a Rating ("Friend", "Neutral" or "Hostile") with each relationship.
I'd like to start by building adding Scoundrels/Contacts relationships