|Before Augustus Chevalier met Mnemosyne, he was already a flourishing and thriving man with blessed with twin boys and a wonderful wife. He was a professor in Zurich, Switzerland and taught world history to his students. He met Mnemosyne in Geneve for a business trip. Mnemosyne and him ran into each other when Augustus had seen her at the business meeting. Mnemosyne was under one of her mortal aliases, Charlotte Baudelaire. She had secretly altered the memories of the men who worked at the building on a regular basis to sneak into the week's meetings to search for a new partner to create yet another demigod with. At the meeting Augustus attended, Augustus had caught her eye and vice versa. After the meeting, Augustus treated her to a drink at the bar. Both drunk adults waltzed to Augustus' hotel room that night and had a one-night stand. The next morning, Mnemosyne revealed to Augustus who she really was. Augustus was beyond shocked. When he returned to Zurich, Augustus didn't dare tell the rest of his family about Mnemosyne. Life continued. Augustus lived a good nine months embracing his Canadian wife, Madeleine, and his one year old twin sons, Dylan and Remy. After those nine months without having to worry one bit about Mnemosyne, more problems arrived.
Two bundled up babies appeared at his doorstep one night. Mnemosyne had tracked down Augustus' address in order to have a place to leave the twins. Unsure what to do, Augustus confessed to Madeleine about "Charlotte", leaving out the bits that Charlotte was actually a Titan goddess, and those babies were half Titan. Madeleine was furious. But as much as she was angry, she had a deep love for children and an especially soft spot for infants. She decided to let Augustus keep the twins, but made him swear never to bring up their mother. The twins were named Alison Coralie and Finn Keller. Shortly after their first birthday, the family moved to Lucerne. Growing up, the twins lived a good life. Madeleine resumed her work being a scientist as soon as Alison and Finn reached the age of five. Augustus never stopped his work, but managed to put his family first as well. Nannies were hired to care for the kids while the parents worked. Thanks to their hard-working parents and the already wealthy life each parent was born into, you could say they were quite spoiled. Alison was very close to all of her brothers, and since she was supposed the youngest and the only girl, they were very overprotective of their sister.
Alison and Finn reached the age of twelve when they were on a school trip in the Swiss Alps. They were accompanied by older students as well, up to the age of eighteen. The children were hiking, and Alison and Finn fell behind from the group. A group of harpies managed to pick up their scent and swooped in to attack. Luckily, an older sixteen year old demigod had his eye on them, as he suspected they weren't normal children. He was able to defeat the harpies and escaped with Alison and Finn unharmed. The next day, a very tramuatized pair of twins were walked home by the older demigod after the school trip to break the news to their parents. Augustus was the only one home at the time, and the three children explained what had happened in the Alps. Augustus was bothered once again with the Mnemosyne problem and was very worried for his twins. When the older demigod brought up the alternate and best option, he sent them to Camp that summer as non-year-rounders. Augustus explained this to the rest of the family, "a special camp for special children like Alison and Finn." This was well bought, as both were exceptionally smart thanks to their genes. They came back that summer as trained demigods, and hid transforming celestial bronze swords in their luggage to smuggle back to Switzerland. Alison had an Edelweiss pendant that could shift into a sword while Finn had an axe pendant.
Training paid off, as Alison and Finn were attacked again that March after their thirteenth birthday by Giant Scorpions while vacationing in Nice. They escaped scot-free. That summer, they went to Camp again. After their fourteenth birthday, a hellhound attacked them while they were walking in town. The two killed it with ease. It seemed as if their life was a rollercoaster that only went up. They had a great education, awesome family, and an unrealistic camp they visited each summer. That was until their family started to fall apart. Early in the school year, Alison and Finn were fourteen, their parents got into a great fight. The fight was so big, that Augustus fled and never returned. Alison, her mother, and her brothers never saw him again. Her mother was devastated. She spent countless nights calling his phone, calling relatives and his friends, but no one seemed to know where Augustus went. It broke her so bad, that she began taking her fury out on her kids. Verbal and sometimes even physical abuse took place in the house. Alison was terrified, but her brothers protected her the most. After weeks of a living hell, Dylan and Remy sent Alison and Finn out of the house to save themselves, promising to keep in contact with both. To their extreme protest, the twins took a plane to New York to Camp. Alison and Finn got their hands on the address, as it was hidden in Augustus' desk. They took a cab to Half-Blood Hill, but a group of stymphilian birds attacked the cab. Alison and Finn's pendants were lost in the airport, but they didn't realize sooner they might need them. Helpless and unsure how to fend off the birds, the cab driver was killed by the birds. They were locked in the car, and it was their doom. Alison and Finn died that night, the stymphilian birds eventually mortally wounding both. The ruckus, however, stirred up quite a commotion from just outside camp borders. Two children of Apollo were walking along when they heard shrieks down the hill. They ran to the twins' aid, but by the time they slayed the birds, all three of the passengers were dead.
The children of Apollo took the bodies (with some help, of course) to Camp. The cab driver was buried, but the campers took just a bit more time to mourn over the loss of their own. Mnemosyne pitied the twins, but she only had the power to revive one. So, doing only the most she could do, she managed to turn Alison into a memory nymph. Alison grieved for her brother, and he was buried as well. Alison was able to Iris Message her brothers, also successfully scare the living daylights out of Dylan and Remy at the same time. She explained to Dylan and Remy of the terrible loss and the secrets her, Finn, Madeleine, and Augustus kept from the two. Although they were confused, miserable, and a bit pissed, they managed to understand. Weeks later, Alison called in again to check on Dylan and Remy. They informed her all was well—her aunt stepped in to take her mother's place and take care of the twins. Alison returned to her camp life, also forging a new shifting pendant which depicted her symbol, an Edelweiss, and her brother's axe.