- last post: 01.01.0001 12:00 AM PDT
Cortana IS AN AI. She's a computer with Dr. Halsey's personality, they built her from Dr. Halsey's brain. She cannot have siblings, two beings of opposite sex did not conceive to have her, therefore she can't have a sister. Dr. Halsey is like 40 years older than Master Chief, when she was like 35 Master Chief was like 6. Throughout the book we see things like Nylund saying she [Dr Halsey] was a motherly figure to the Spartans...
Even if Master Chief had a sister, and that sssss somehow was sister, she would have died on the planet the were on (Eradiunus V or something) because it was in the outer colonies, which the Covenant glassed first after Harvest. You cannot survive lighting a planet on fire with plasma. Anywhere NEAR the plasma you'd get burned like hell and filled with radiation. There's no way anyone survived.
*and they wouldn't have taken Master Chief's sister with the Spartans. That would be rediculous, they would recognize eachother and be significantly closer than the other Spartans, and we know Kelly and Linda were not his sisters.