Easter road toll climbs to 14

An eight-year-old girl is dead and her older brother is fighting for his life after a crash in NSW that has helped push the national Easter road toll to 14.

NSW Traffic and Highway Patrol Commander, Assistant Commissioner John Hartley, said Easter was a time when Australian families came together.

But after a horrific crash on a wet Central Coast road on Saturday evening, "we have a family that has been torn apart".

The eight-year-old died in Westmead Children's Hospital on Sunday morning.

Her nine-year-old brother is in a critical condition in the same hospital while a third child, a 12-year-old boy, is listed as stable.

Four women were also injured in the crash involving a car and a ute at Doyalson.

"Please, before you get into your car today, talk to each other, make the commitment to whoever is in your car or on your bike, that they are your responsibility," Assistant Commissioner Hartley said.

"Don't become distracted, don't drive faster than you should, and for everyone's sake - don't become complacent."

He warned drivers returning home from the long weekend to expect delays and be patient.

Another child, a four-year-old boy, was killed in Brisbane on Sunday.

The boy was hit while riding his scooter in Logan, south of Brisbane.

He sustained head and chest injuries and died at the scene.

It took Queensland's Easter road toll to seven.

"This looks like to be the worst Easter we've had in several years," Inspector Ivan Sikorsky said.

Also on Sunday, a woman pedestrian, 61, was killed in Sydney's west.

Police in Western Australia have released details of a crash on Thursday.

A 78-year-old man was injured when his car left the road and rolled at Coodanup, south of Perth, and the man died in hospital on Friday.

In addition to the seven deaths in Queensland there have been three in NSW, two in Western Australia and one each in Victoria and South Australia.