A mother has died while her husband and son have suffered critical injuries after a head-on collision on the NSW south coast.
Tamy Mobarrez, 36, was in the car with her husband and five-year-old son when their Subaru smashed into a Volvo at Milton on Thursday afternoon.
She died at the scene, while her 36-year-old husband Hamid who was driving the car was taken to Liverpool Hospital with critical leg and head injuries.
Also in the Subaru was their five-year-old son Eli, who was initially taken to hospital in Milton with facial injuries but later airlifted to Sydney Children's Hospital in Randwick when his condition deteriorated, a NSW Ambulance spokesman told AAP.
Both males are in a critical condition.
The driver of the Volvo, a 39-year-old man, was taken to Milton Hospital for observation and will undergo mandatory blood and urine tests.
"The investigation is still in its infancy, so all those lines of enquiry will be investigated," Inspector Katie Orr told reporters on Friday.
One of the witnesses to the horrific collision, Lisa Elmes, was also one of the first people at the site of a Boxing Day crash that left actor Jessica Falkholt in a critical condition and killed her sister and parents.
"I just could not believe what I'd witnessed so close to the other tragedy and so close to home," Ms Elmas told Network Ten.
Mr Mobarrez worked as a swimming coach at Sydney's Kincoppal-Rose Bay School.
A Go Fund Me page was set up on Friday afternoon to raise money for the coach on behalf of the families of swimmers.
"Hamid has trained so many of our children to be strong, both in the water and out," the page's author wrote.
"Let's all pull together and do what we can to help him and little Eli get well."
