Sadler, 44, said his son Michael was diagnosed with Acute Lymphoblastic Leukaemia (ALL) in April 2014, aged two, after he “started experiencing pains in his legs”.
“A few days later it was too painful for him to walk,” he said.
“So we ended up going to A&E and by 11pm that evening we were told he had a diagnosis for ALL.”
He said the diagnosis had a huge impact on the whole family and they struggled to know who to turn to.
But the charity Young Lives vs Cancer, which he now volunteers for, stepped in and supported the family “hugely” through Michael’s illness.
“It was a week before Michael’s third birthday – we ended up moving to Bristol with a two-month-old baby,” he said.
“It’s really hard to access everything but they gave us somewhere to live, social workers, nurses – we couldn’t believe people did things for us.”