Calla was born in Italy to two picture perfect parents, Aeila and Cato were the happiest couple you could find. On the outside. To the public they were in love, behind closed doors they resented each other. Whilst she may have been born in Italy the Zarikos family moved quickly to greece where her father, a soldier was transferred to. It was there they learnt about his anger. After a bad day he would snap over the simplest things, lashing out on several occasions at both Aeila and Calla. It was during one of those occasions she showed her first signs of magic, a pot flew off of a shelf almost knocking her father out.
Things weren't however bad for Calla. Not entirely anyway, it was also at the base that she met Finlay. The two were close friends and grew up together, attending the same school. Then, once they were older he kissed her. Which began the start of their relationship which ended as quickly as it started. Aeila, having had enough of Cato, packed the two of them up in the dead of night to travel to London. There she began to attend Hogwarts but still had the constant fear of her father hanging over her. She was surprised when, in her 6th year Finlay turned up.
Now in her 7th year she's friends with Finlay again, and has told him about why she had to leave. They began dating again in their 7th year and upon graduating, the two of them got engaged, they married over Christmas before Calla had to suddenly leave to take care of her mother. Her mother recovered quickly and Calla returned home to Finlay in time to watch him in the world cup.