system
Given the following post, respond as if you're commenting on Reddit:
human
[Terminator] Kyle Reese survives the end of the first movie. How does this change Sarah, John, and the events of T2: Judgement Day?
gpt
They still would have gone on the run (Kyle is connected with a number of weapon charges and acts of violence, and no one is buying "future homicide robot" as a defense), but having Kyle around would mean that Sarah had both A) an entry-level tutor for a broad range of skills relevant to the future war and B) a friend and comrade who knows and understands what she's gone through. The former would eliminate her need to shack up with random guys to learn skills, and the latter would probably have a *massive* impact on the quality of her mental health. 

The family would likely spend most of it's time down in Central and South America, doing their best to stay off the grid and to prepare for the future as best they can. They would likely run in similar circles to main continuity Sarah (since Kyle's skill set and the skills Sarah wants to cultivate for both herself and John lend themselves well to paramilitary/illegal activity), and cultivate a reputation for skill and professionalism. They still might try to blow up Cyberdyne, and being a two-person op instead of a solo run would greatly increase the chances of the mission going off right, instead of Sarah winding up in Pescadero and John in the juvenile system.

John, in turn, would have grown up with a healthier and more stable home life. The presences of Kyle, both to serve as father and tutor, means his life is much more consistent; instead of bopping around between a bunch of different guys to learn skills and act as ersatz father figures, he has *a father* who can teach him not only general skills, but stuff that will be really, *really* handy in the future. 

If T2 still happens, Sarah is likely not stuck in an asylum and the family is likely all together. There's a high chance they're not even in the U.S., meaning that if the T1000 still starts in LA they're going to have a much harder row to hoe trying to find them. "Uncle Bob", meanwhile, would have inside-track info from John himself on where to find them, so would definitely beat the T1000 to the mark. From there (and assuming Sarah doesn't blow it's head off with an anti-tank rifle before it can say anything), the fight between human and machine is 4 on 1, likely with greater resources and a running start since no one needs popped from the loony bin.