Samuel Hastie was two-years-old before he could sit up by himself.
It was a milestone that should have been notched up when the now-6-year-old was a baby.
His parents, Angela and Vincent, knew "something wasn't quite right" but it took 14 months before he was finally diagnosed with a severe form of Duchenne's Muscular Dystrophy, a muscle-wasting disease which also sees sufferers have problems with motor skills such as running and jumping, have frequent falls and trouble climbing stairs.
The weakness progresses quickly and breathing and heart disease usually start by age 20, leading to heart failure.
Given Samuel suffers an aggressive form of the disease, he's not likely to make his 20s.
The doctor had told them that Samuel had been having symptoms of a teenage Duchennes sufferer since he was 5.
Hastie said most boys could live up until they're about 30 but they'd been told that Samuel would be lucky to make "late teens" due to his aggressive progression.
Liam was trained to do everything from wake Samuel's parents if they're needed while asleep, to picking up toys he's dropped from his wheelchair.
Liam not only helps Samuel, but also Lukas, his 8-year-old brother, who has been diagnosed with autism and ADHD.
"Liam fetches help when Samuel asks for it. For the [sleep machine] if that beeps at night, he will come and get us ... he's generally pretty good at picking up when its needed."
Lately he'd been waking them by laying his head on her husband's arm, she said.
Liam goes to bed with Samuel about 6pm each night, however once he's asleep Liam will get up and socialise with the rest of the family before heading back to bed again.
One of the symptoms of Duchennes is tiredness. When he was younger, Samuel would sleep up to 18 hours a day. Now it is about 13, she said.