Five-year-old boy survives car crash that claimed the life of three men, including his father and grandfather.

The car was located by a neighbouring landowner about 5pm on Monday after the boy was found wandering on a property in the Hunter Valley in regional NSW.

Police said three men and the child were travelling to the property off Waverley Road in Gundy, east of Scone, when the vehicle rolled down a steep embankment.

On Monday morning, the boy, his father, aged in his 40s, and his grandfather, aged in his 70s, travelled to the area from Sydney to inspect the farm with the property owner, The Daily Mail reported.

Concerns were raised for their welfare after they failed to return.

However, emergency services were called to the crash scene after the young boy was found by people on the property.

All occupants were ejected from the vehicle, killing the three men.

The little boy was found nearby after suffering minor injuries, including a broken arm. He was airlifted to John Hunter Hospital where he remains in a stable condition.

It is not yet known what caused the crash as a report will be prepared for the Coroner.

Inquiries into the cause of the crash are ongoing with examination of the scene expected to continue on Tuesday.

Our thoughts are with the family and all involved.

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