Simple really how do you do it, I tried adding a bandit to the player ally faction with 0005A1A4 1 and it seemed to work but they still attacked me I used the code stopcombat but it only stopped them for a moment, any ideas on how to do this?

Also adding factions doesnt work on 100% of the NPCs of the faction you can try to mess with their aggression parameters but then they will probably just not attack anything. (It basically can get buggy when you add yourself to normally enemy factions)

Does this do anything?
player.setrelationshiprank

Thanks for the help yes it does, for anyone interested you have make the targeted NPC join the player faction then set their relation to 4 then stop combat and then they act like a normal NPC.