I think it might go

(Gaia)
Final Fantasy I
Final Fantasy VI
Final Fantasy IX

Timeline
Garland controls time > Garland Creates Zidane and Kuja while in ruling > Garland is defeated by future Light Warriors > Edgar Marries somebody > Future Alexandria or Lindblum Kingdom > Final Fantasy IX

( Ivalice )
Final Fantasy II
Final Fantasy IV
Tactics Universe


Richard Highwind is born > Wife gives birth to Kain > Kain looses his family > Firion defeats Paramecia > Kain grows up with Cecil and Rosa > Cecil destroys Zeromus > Develops into Ivalice > Tactics > Final Fantasy XII

( Crystal/ Job Class World )
Final Fantasy III
Final Fantasy V
Final Fantasy VIII
Final Fantasy XIII
Final Fantasy XIII-2
Final Fantasy Versus

Crystals are born > The Light Warriors ( This Universes's version ) are choosen > They defeat Dark Cloud and Xande > The Dawn Warriors are choosen, they seal Ex- Death > Bartz is choosen > Ex- Death is unsealed > Bartz defeats Ex-Death.

Years, Years later Laguna is born > Laguna marries Raine > Squall defeats Ulti

Years, Years later Lightning defeats Evil Pope > FF XIII-2 > LR > Versus


( Spira/ " The Planet ")
Final Fantasy X
Final Fantasy X-2
Final Fantasy VII

Shuyin > The Fayth Dream Tidus > Tidus and Yuna stop Sin > X-2

Years later Final Fantasy VII

I assume that some time between Final Fantasy VII and Final Fantasy VIII the Centra visit the " Crystal Job World " to try and flee from Jenova, however they all die anyways from the Lunar Cry.

Just is all just fun though.