Police have named the three people killed in a crash on State Highway 1 near Tokoroa on Tuesday afternoon.
They were 53-year-old Warren Lee, 52-year-old Aesoon Lee and 20-year-old Julia Lee.
Warren and Aesoon Lee were American citizens living in Hong Kong.
Their daughter Julia Lee had been living in Massachusetts, but was due to start university in Auckland and her family had come over to settle her in before heading back home.
Her 18-year-old brother, also an American citizen living in Hong Kong, remains in a critical but stable condition in Waikato Hospital.
Julia was driving the car when it crashed.
Her brother was a front seat passenger and her parents were in the rear of the vehicle.
The investigation into the cause of the crash is continuing.