Frank

Frank is the brother of Joey Phillips.

History
While out patrolling, Jack and Ben noticed Sarah, standing in an alley with blood on her clothes. Jack got out and tried to follow her, but she ran away without saying anything, leaving behind her stuffed bear. Jack saw her again at the homeless camp and she told him that they told her not to get help, but her brother was dying. She led them to Joey Phillips, who was injured when he fell through a floor in an old warehouse while looking for a place for them to sleep because Sarah's always cold. They noted that his collarbone was fractured and he was altered. They prepared to take him to the hospital, but he objected, as did the other kids, including Frank. Sarah said some of them were bio siblings and some were foster. They ran away when their foster dad got arrested and if the state found them, they'd be split up. Joey was keeping them together. They had to intubate Joey and then they took him to the hospital. Jack instructed the other kids how to get to Grey Sloan Memorial and told them to meet Joey there. They ran to the hospital alongside the ambulance and when they got there, they ran inside and sat together in the waiting room for news about Joey. ("House Where Nobody Lives")

They were later taken by social workers. ("Save the Last Dance for Me")

Familial
At some point, he ended up in foster care, in a house with Joey Phillips, Sarah, and Ernie. When their foster father was arrested, they ran away together and started living on the streets. They were split up again when Joey was hospitalized and social services was called for the other three.