Henri is the stepbrother being integrated into the Parker family. His father was horrendously abusive to Henri growing up, in large part due to his alcoholism and being an aggressive drunk. The poor home life that Henri lived in taught him to be tough and to take no shit. It also developed a deep-seated depression inside of him that he struggles to cope with in any healthy manner. He grows attached to his new brothers quicly, however, and becomes fiercely protective of them in turn, even if he feels like there's not much he can do to actually protect them.

Henri was born an only-child, the first kid of his mother and father's failing marriage. By the time he was five, he understood that his parents didn't love each other, and a year later, his mother left without looking back. His father took the divorce hard, and his already difficult drinking problem only grew worse. His father began taking out his anger on Henri, and Henri quickly learned to avoid his father as much as possible--especially when he was drunk.

During the difficult period of his childhood, Henri took refuge in poetry and music. He started writing his own poetry to deal with the bad times at home, because it offered him a way to unleash his feelings or create an escapism. Music offered him much the same. As he neared his teen years, he stole a pack of cigarettes from one of the older kids at school which kicked off his own addiction to smoking. Henri poured himself into these habits and hobbies, trying to keep the depression from turning him to darker solutions.

His father started dating a woman when Henri was in high school. Henri didn't believe that it would last long, but much tohis surprise, they ended up getting married. Considering how his parents' marriage worked out, Henri was not confident in this marriage, but he did not want to neglect his would-be brothers. Jared was a couple years younger than him, trans and dealing with his own issues from a bad home life; Eric was a few years older than him and took care of the household like he was the father in charge. Henri liked them, and even if he didn't like their mom and didn't think the marriage would hold together, he wanted to get close with them.

Eric displayed some tendencies from time to time that mirrored Henri's father, which made Henri all the more protective of Jared, who would receive this backlash from their older brother. Henri and Jared grew incredibly close and Henri ended up developing a complicated friendship with a boy from his school named Damien, who offered him his own refuge from his life in different ways.

A year after they were married, his stepmother got pregnant. Eric was especially stressed at the idea that a new child would be forced to live in such a terrible environment, and so he worked to gain custody of not only the new baby, Finn, but also of Jared and Henri. Henri was surprised, figuring he would have absolutely no place in this new home Eric wanted to make, but he was grateful for a way out of the house. He still had his gripes with Eric, but Eric was much more willing to change and improve himself than Henri's father ever was, and so Henri hoped that this new life with Eric, Jared, and Finn would be for the better.