Aidan Mark Ashcroft was behind the wheel of a minibus carrying nine of his relatives, all from the central west NSW town, when his Toyota and a Ford sedan collided about 7.40pm on Friday.

Mr Ashcroft, 38, and the driver of the sedan and one of his passengers were all killed in the crash near Southern Cross, 225km west of Kalgoorlie.

The passengers of the minibus - four adults and five children, and a second passenger in the sedan were injured.

They were taken to Perth by the Royal Flying Doctor Service for treatment.

Curtis Watchorn was in the rear of the sedan and was admitted to Royal Perth Hospital.

Yesterday sister-in-law Sarah Watchorn released a statement.

"On behalf of Curtis and the entire Watchorn family we would like to express our deepest condolences to the families of the other people involved in this tragic accident," she said.

"While nothing that we say can do anything to lessen the grief for those involved please know that our thoughts and prayers are with you during this time."

The Watchorn family thanked the many people involved at the scene of the accident - St John Ambulance, WA Police, Fire and Emergency Services, Royal Flying Doctor Service, doctors, nurses and staff at Southern Cross Hospital and anyone else they may not know who helped in the rescue of the 10 people.

"We would also like to thank the many people at Royal Perth Hospital who are treating Curtis," Ms Watchorn said.

"They have worked tirelessly, and with the utmost professionalism."

The surviving adults from the crash were admitted to the hospital.

The patients were all in a stable condition, a hospital spokeswoman said yesterday.

The young people aged between three months and five years who were in the minibus were taken to Princess Margaret Hospital for Children.

All five were in a stable condition, a spokeswoman for the hospital said yesterday.

faye.wheeler@ruralpress.com