Killian was born the oldest of four siblings. Jarred who is only one year younger than him, being so close in age they fought like cats and dogs for most of their childhood. The year that Killian went off to Hogwarts and left his brother behind somehow transitioned their relationship from rivals to friends. They would write each other each week or at least every other week and by the time the summer rolled around their intense sibling rivalry had all but vanished. The following year Jarred was sorted into a different house than himself and this only seemed to help their relationship as they were still close but maintained a relative amount of distance that comes with sleeping and hanging out in different common rooms. In the privacy of their family home, Killian was an obnoxious kid that threw tantrums and rebelled against his parents at every opportunity, but that too changed the year he went to Hogwarts. Schoolwork and Quidditch seemed to keep him too occupied to be the miniature tyrant he’d been at home. Mostly, as an adult looking back, he just assumed he’d been bored and frustrated at his inability to perform magic as an underage child. Meeting and hearing about everyone else's families both the rich and poor seemed to also make him appreciate what he had and he's been a pretty calm laid back guy ever since. Killian did fairly well in school, mostly with spells and wand work. He can pull off a potion as long as he follows the directions to the letter, but it was never his best subject. Any essays or reports he had to turn in however, were a different story. He didn't have the patience to sit and write them and they were usually too short, or he hadn't put in the time or research necessary to back up his theories or opinions. After graduating from Hogwarts, he went into the family wizarding construction business with his dad and brother Jarred who joined a year later when he too graduated.