The story of how Harold's father and George's cousin passed away is in the notes and credits. But please don't report as it is just my headcanon!
George's cousin's back story: Her name was Avery. She was on George's father's side of the family who got into a car crash and sadly did not survive. She was 13 but her sister survived at 8 years old. George was 8 when his cousin passed away. (Please don't report this project. I'm trying to tell the lore) Harold's father: When Harold was 6 and his sister was 2, they and their mom moved from Italy to the United States. His father had cancer so he couldn't come and sadly died a year later