Oookay ... the list is just a list, it's not a yardstick for judging whether ur doin it rong. I didn't even put much thought into it, I just looked at what I saw in the thread and organized what I observed.
Good grief people. Just ignore the list if it seems inaccurate or doesn't fit your situation. It's just there as a conversation-starter, not as a Statement of Law.
In the end I'm sure there's no exact line where relationships begin/end. In fact the cashier at the grocery store could be considered someone you have a very brief, cordial relationship with (depending on how you define relationship).