Kenneth was born in London to a Muggle-born Witch and a Muggle. His parents decided when he was born that while they would not hide the knowledge of the magical world from him, they would encourage him to primarily interact with and learn of the Muggle World. They did this for two reasons. The first was that they thought it would help his overall growth and encourage him to make friends with people he's never met before. The second was that, with all the rumors in the magical world of the rise of You-Know-Who, they thought it would keep him protected and sheltered from dealing with such dark topics when he was so young.
For the most part, his parents' plan worked - before he really understood that the magical world was supposed to be secret, Muggles he spoke to thought it merely a flight of imagination from a child. Once he understood it had to be kept secret, it just appeared that he had outgrown that phase. His childhood was like most other boys, including attending primary school and playing football. It was during a football match when he was 9 that his parents first really noticed his magical abilities - he was racing toward the goal and kicked the ball, then watched it soar in an arc around the keeper and into the net. While the coach and other players just assumed he'd managed a flukey kick, his parents knew the truth.
From that day forward, they slowly increased his exposure to the magical world, letting him learn more about it and explaining magic in general. The defeat of You-Know-Who also made them feel more at ease with doing so. Increasing his exposure also enhanced his curiosity. He constantly asked questions and went poking around for any books on magic. When his Hogwarts letter arrived, his quite-proud parents took him shopping for his school supplies, including his wand. He got home and began reading through the Standard Book of Spells, Grade 1. He found himself having a fairly good grasp of the Charms presented, as well as the basic fundamentals. Unfortunately, his parents were quite strict about him actually practicing them, particularly after he accidentally set a chair on fire.
Now, on September 1st, he stands on Platform 9 3/4, trunk packed, waiting to board the Hogwarts Express, and eager to be fully immersed in the magical world for the first time in his life.
