Alvin & Evanna (née Blake) Breckenridge
Alvin and Evanna are Kingsley's parents, whom he loves the most in the world. He maintains good relationship with both of them, but he's slightly closer with his mother than his father, who's often away at work for quite a long time. While Evanna is the one who first taught Kingsley flying and Qudditch, which he was instantly fascinated by - and he still loves it until today, Alvin is the person whom he respects the most. Despite being a reckless and immature person, his traits of being a trouble-maker would usually disappear in front of his father, who, to Kingsley, has a threatening no-more-misbehavior aura when he gets angry (though no one would have believed this until they witness Alvin getting angry with their own eyes, as most of the time, Alvin is a humorous and easy-going person). Nevertheless, Kingsley loves talking with his father and he looks up to him for many different matters.
Kelvin is Kingsley's "dear little brother", who's almost two years younger than him. Kingsley cares much about his brother though the two don't play with each other much as they grow up - Kingsley likes playing Qudditch more while Kelvin feels more comfortable around words. Though he never shows it obviously, Kingsley actually cares about his brother a lot, always watching out for him behind his back.
Katrina is Kingsley's "pretty little princess", as known as his younger sister, or his another target to tease, for fun of course. Kingsley is older than her by three years, and he, needless to say, loves her as well. He always thinks that Katrina is the younger version of their mother, Evanna, who's a vivacious woman and an excellent Qudditch player. The two used to play a lot when they were very young, but not as much now, as they both respectively have their own friends. Still, they do occasionally hang out, with or without Kelvin. Kingsley cares about as much as he cares about Kelvin - though he rarely says it or shows it out loud, he always look after her behind her back.
Eric is Kingsley's best friend, cousin and partner-in-crime. They have known each other forever - even when they both entered IAM, they were sorted in the same house. They hang out a lot of times, enjoying making troubles for fun - they always have each other's back.
Edmund is Eric's older brother, making him Kingsley's cousin as well. Edmund often played with him and Eric - or more like Edmund looked after them when Eric was playing with him - when they were young. Though, as they entered the Academy which gave them less time to spend together, they have been growing more and more distant. The impression that Edmund has left him is just his best friend's "perfect older brother", from the complaints that Eric has made.
Miranda (née Blake) & Lucas Turner
Miranda is Eric and Edmund's mother, and thus, the younger sister of his mother, making her husband, Lucas, his uncle. Kinglsey doesn't have much to say about the two except that Miranda is a cool Qudditch player.
Anastasia (née Breckenridge) & Raphaël LeClaire
Anastasia is Alvin's younger sister, and hence, Kingsley's ex-Auror aunt. She's married to Raphaël LeClaire, who was an Auror as well. To him, both Anastasia and Raphaël are nice people. Unfortunately, an attack from a dark witch killed Raphaël many years ago, leaving Anastasia with her daughter, Diána, while her two other children, Raymond and Séléna, were kidnapped by the dark witch. Since then, Anastasia moved (back) to the North Breckenridge Manor, where Kingsley and his family were living in. A year ago, her children who was MIA went back as some sort of a plan of that dark witch. Diána was killed while Anastasia is currently in a coma. Kingsley is actually very upset by this as Anastasia had been treating him with kindness as if he was her lost son. He just hopes that everything would turn better for the family.
Raymond, Séléna & Diána LeClaire
Raymond, Séléna and Diána are the children of Anastasia and Raphaël, hence, his cousins. Among the three, he is the closest with Diána, having lived with her for about a decade, ever since that tragedy. She was quiet when she and her mother first moved into the Manor, probably because of the shock from the attack, but she soon got more closer with him and his siblings, especially his younger sister, Katrina - they played with each other quite a lot and Kingsley cared about her as if she was actually his younger sister. However, Diána died a year ago in the come-back attack from the dark witch. It was the first time that Kingsley actually felt devastated as he had never lost anyone that he's close to before. Also at that night, his long lost cousins, Raymond and Séléna, came back. While Raymond, who's a few month younger than him, is having an amnesia under the Memory Curse and now has decided to travel around the world to get all those mess off his mind, Séléna, the twin sister of Diána who looks exactly the same as her, is locking herself in her own world. He figures it'd be the best not to annoy them and looks after both of the, at their behind, just like he did with his younger brother and sister.
Mirabelle Breckenridge & Benjamin Chevalier
Mirabelle is his father's younger sister, while Benjamin is Mirabelle's divorced husband. Kingsley seldom meets her aunt as the two are both workaholics, whereas for Benjamin - Kingsley hasn't met him for years after the divorce.
Caroline is the only daughter of Mirabelle and Benjamin. They don't know each other much as he only sees her about twice to thrice a year, and sometimes at the Academy - when it comes to her, he could only comment - a typical Iherjerika.
Click here for the family tree of Kingsley.