It should've been a routine childhood illness, just like his sister had. But little Rio didn't have gastro. He was dying. Ryan Fowler tells LAURA TURNER about his little boy's last days, and why he'll run a thousand kilometres to help ease the pain of other parents facing unimaginable grief.

RYAN Fowler cranes his neck toward the sky, his red-rimmed eyes trained on a light blue balloon.

He watch...