Sole survivor of fatal NSW crash in induced coma

Investigations are continuing into the fatal crash on the NSW Central Coast that killed three members of one family and left another in a critical condition.

Darren Milne, 42, his wife Susana Estevez-Castillo, 39 and their 11-year-old son Liam Milne died at the scene when their car veered off the road on Enterprise Drive on the Central Coast and struck a tree.

Their younger son, 7-year-old Benjamin Milne, is in an induced coma with head, back and internal injuries and is believed to be undergoing surgery today, police said.

A report is being prepared for the coroner.

No update has been given on the possible causes of the crash.