Amanda and Hannah were born in Kamloops, British Columbia, Canada, in the year 2088, the second and third (Amanda jokingly refers to herself as the older twin) children of Matthew and Evelyn Sinclair. Informed before their birth of their situation and the likelihood of them dying in infancy, their parents did not opt for an abortion. After crossing a number of important hurdles, the twins emerged as happy, healthy children, their lives understandably the focus of intense public curiosity and media attention. While their parents did their best to strike a balance between appeasing the demand for information and raising the girls normally, by the time that they started the first grade, they were well aware of just how different and special they were.
While some dicephalus twins manage to co-ordinate the fine motor control needed to master everyday tasks, doctors advised caution and patience when the girls were young. Thankfully, this proved largely unwarranted. Amanda and Hannah seem to be able to anticipate each other's movements perfectly and rarely need to communicate in order to co-ordinate their movements. As their older brother Nate was an avid videogamer, the girls would often play with him. Before long they became deeply interested in videogaming and general geek culture, and this carried through into their teens. With two sets of eyes and two minds to process information, their situational awareness was difficult to beat.
As they progressed through high school, sporadically in and out of the public eye, the two of them made a decision: a 'normal' life and career were not in the cards, and their uniqueness was best embraced and used as a source of profit. Shortly after their eighteenth birthday, Hannah and Amanda moved to Vancouver to try their hands at professional gaming. They also studied programming and public relations on a part-time basis at UBC. Firmly ensconced within the 'geek' scene, they became regular attendees and a sometime attraction at gaming, comic, and anime conferences, often getting involved with cosplay. The twins have always been secure enough in their separate identities to eschew ham-fisted attempts to assert their individuality. The truth is that they have pretty similar personality types and their interests overlap significantly. The only notable difference is that Hannah is slightly more bookish and knowledgeable, while Amanda tends to take the lead and is a better judge of character.
They were in nearby Seattle, doing a series of interviews for the upcoming Emerald City Comicon, when the world ended. Perhaps playing so many videogames and watching so many zombie movies imbued them with the paranoia to survive. Amanda and Hannah mostly just stockpiled necessary items and hid for the first couple of months. They taught themselves to shoot an actual gun and found that it was a bit harder in the real world. Upon hearing the call to Refuge, they made their way there immediately.