User blog comment:DancePowderer/Where There's Vinsmoke, There's Power Part 2/@comment-53507-20160129072414

I once though that the Vinesmoke should be wealthy bankers which would make much more sense. I once thought that Sanji's family were onboard on the Orbit and travelled to the East Blue by some river across the Red Line connected to the North Blue to the East Blue but Oda has never shown the Red Line in full. For example look at the global map of the Red Line and it looks flat with some mountains on it, then we are shown that the Red Line Mariejois is on is a tall rock.

However Oda may not have even thought of Sanji's backstory when he first drew him and added extra scene in a Jaya flashback which was not originally there. So I'm going to wait for a flashback to explain this