Fake John Connor Existence?

if you have followed the whole terminator series of movies, you should know that John Connor sends a soldier to protect his mother in the first movie, Soldier fornicates with mother to create John Connor, so if he sends his own father though time to fornicate his mother, how is he born,cus like the soldier dies, and if he dies in the present he is not able to live in the future, are you getting me its like a total mess, so the real question is how can this really happen, I mean he sends his own father to the past to F*** his mom, and to create him, father dies this would create chaos in the future time, cus the creation time would be disturbed? HELP!!!!!! hahaha, all desperate hahaha naw, just wondering :D