A teenager who allegedly caused the deaths of a Northland mother and daughter is still unfit to appear in court.

The case of the 19-year-old was called in the Whangārei District Court this morning and he was further remanded in custody until April 15.

He was not present in court today and his lawyer Julie Young informed Judge Keith de Ridder it would be at least a week before he was fit to attend court.

Janiah Fairburn and her daughter Azarliyah Hadfield died in the crash on SH 1 in Northland. Photo / Supplied
Janiah Fairburn and her daughter Azarliyah Hadfield died in the crash on SH 1 in Northland. Photo / Supplied

Interim name suppression was continued until his first appearance in person in the court next week.

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Janiah Fairburn, 20, and her 2-year-old daughter, Azarliyah Hadfield died after their people mover collided head-on with a silver sedan driven by the 19-year-old at Topuni on March 30.

Fairburn's partner, Henare Hadfield, suffered broken ribs and a punctured lung and is recovering at Auckland City Hospital.

Their 1-year-old son, Te Tairawhiti Hadfield, is being treated for spinal injuries at Starship hospital.

The defendant is facing two charges of driving with excess breath alcohol causing death, and another of failing to stop.

He allegedly had a breath alcohol level of 768mcg of alcohol per litre of breath at the time of the crash. There is a zero alcohol limit for motorists aged under 20, while the legal limit for those over 20 is 250mcg.

The man was unable to leave his hospital bed for his appearance in the North Shore District Court on Monday last week and was remanded in custody at Auckland City Hospital. He was granted interim name suppression.