'Painful days ahead': Australian Olympian's son killed in driveway tragedy

Isaac Ntiamoah took part in the 2010 Commonwealth Games (pictured) and 2012 London Olympics. Pic: Getty

A one-year-old boy who died after he was struck by a car in a driveway in Sydney's west is believed to be the son of Olympic athlete Isaac Ntiamoah.

The toddler was hit by the car at the front of a Green Valley home about 3pm on Friday, NSW Police said in a statement.

His mother took him to Liverpool Hospital but he died a short time later.

The boy is believed to be Josiah Ntiamoah, the son of Australian relay and track athlete Isaac Ntiamoah.

Ntiamoah was driving to and from his house to pick up supplies for his son's birthday party, The Daily Telegraph reports.

Isaac Ntiamoah pictured with his wife and baby boy, held by a friend. Pic: Instagram/Daily Telegraph

In a statement on Sunday afternoon, the Ntiamoah family said Josiah was their "joy and delight".

"He was our miracle baby. We cannot believe he is no longer with us," the statement said.

"What we do know is that he is with his heavenly father and we trust that God will help us in these painful days ahead."

The family asked for privacy as they "honour his memory" and grieve with family and friends.

Police have taken the car for forensic examination and the boy's 36-year-old father has been subject to mandatory blood and urine tests.