In January 2018, Will's pediatrician noted that he hadn't gained weight for a few months. Being cautious, the family was sent to the hospital under the assumption that William was having GI issues.

Will was seen at the ER and the doctor ordered labs.

The doctor felt William's belly after the labs had come back a little funny and it seemed a little swollen. However, these abnormalities could all be explained from a virus, since William had been getting over a cold. The ER doctor ordered an ultrasound as a precaution.

The radiologist that conducted the ultrasound was the one who informed the Holbrooks that William had what appeared to be a large tumor on his liver.

Jake and Stephanie met with doctors at the Jimmy Fund Clinic and had a CT scan the next day. They then learned that the cancer had spread to Will's lungs.

His treatment has included chemotherapy and surgery.

Will loves listening to music, dancing, and going for walks. He loves dinosaurs and balloons.

Will had his last chemotherapy treatment on July 18.