In "Family Law", Julio is approved to be a foster parent and takes emergency placement of an eight-year-old boy named Mark Jarvis who is racist with an attitude problem. At the end of the episode, it is discovered that Mark's mother has been murdered and he has nowhere to go. Julio continues to foster Mark through the investigation into his mother's murder and the investigation into the Zyklon Brotherhood. Julio and Mark develop a father/son relationship that ends when DCFS finds Mark's grandparents and are forced to remove him from Julio's custody, leading to an emotional goodbye between the two. Following this, Julio is shown to keep a picture of Mark on his desk until Mark returns to his life after his grandfather's stroke. After the stroke, Mark's grandmother chooses to transfer permanent legal guardianship of Mark to Julio, making Mark Julio's legal ward.