TV actor and sister fighting for life after crash

Television actor Jessica Falkholt and her sister Annabelle are fighting for their lives after the Princes Highway crash that tragically killed their parents and another person.

Lars Falkholt, 69, and wife Vivian, 60, died when their car collided with another vehicle on the New South Wales south coast on Boxing Day, with their daughters taken to St George and Liverpool hospitals in a critical condition.

Annabelle, 21, is still in a critical condition in Liverpool hospital while sister Jessica, 28, is at St George Hospital.

Falkholt is an actor on Home and Away. (Supplied)

The other person killed in the crash on Tuesday was an Ulla Dulla man aged 50.

Jessica is credited with roles on Underbelly: Badness, a number of prominent stage plays and most recently Home and Away.

NSW Police Chief Inspector Phil Brooks said the Christmas and New Year period was "meant to be a time of happiness" but "sadly for many this has resulted in tragedy".

Jessica Falkholt is an actor with a series of prominent roles to her name. (9NEWS)

With New Year's just around the corner, police have urged motorists to not be complacent on the roads.

The south coast crash has brought the death toll to 21 since December 15, which marked the start of Operation Safe Arrival, the state's Christmas and New Year road safety campaign.

Seven people were killed during the same period last year.

The crash claimed the lives of the actor's parents.

“This Christmas and New Year period is meant to be a time of happiness and to spend time with family and sadly for many, this has resulted in tragedy," NSW Police Chief Inspector Phil Brooks said.

"Out of these 21 deaths, 11 road users have been involved in matters where their vehicles have simply left the road and crashed into a telegraph pole or a tree.

The crash also killed an Ulla Dulla man aged in his 50s.

“There are more cars on our roads and sadly, personal responsibility is lacking many road users. The impact of road trauma is significant.

"Out of 433,000 random breath tests, 739 drivers are facing the courts in the New Year for a range of drink-driving charges putting themselves, their passengers and other road users at great risk right throughout the NSW road network."

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