I decided to play a game with more than two players (in offline mode) and set up a game with 4 players, two per team.  I locked the teams so there wouldnt be backstabbing, just us against them. Well.....my ally did attack me eventually, though Im not sure why.  I tried to do his mission requests though this is my first experience with that aspect of Sins.  Maybe I wasnt quick enough?  How do I keep my ally from turning against me?  The other team had me between them and it was like 3 against one. Eventually I ended up taking my biggest fleet and wiping out my "ally" while the other team rolled up all but two of my planets (I had 7 or 8 out of 27).  I had lost all my colony ships and they blasted any I made so I just went from world to world nuking planets.  I really need a concise guide to the player requested misisions (destroy tactical stuff, civic stuff, ships of so and so etc).  Or at least some idea why the teams didnt stay locked.