Interesting, doesn't seem to fit in with the original Terminator story...
Terminator: Genisys - Wikipedia, the free encyclopedia
On the verge of winning the war against Skynet, Connor sends his trusted lieutenant Kyle Reese back through time to save his mother's life and ensure his own existence. But what he finds on the other side is like nothing he ever expected.
After being orphaned at age 9 by a Terminator, Sarah Connor has since been brought up by another Terminator, played by Schwarzenegger, programmed to protect her. This Terminator has then trained her to face her destiny, which she adamantly tries to reject