'It is just too hard to imagine the pain everybody is feeling'
The families of two teenagers who were killed when their car collided with a teacher from their school have paid tribute to the "inseparable" high school sweethearts.
Hayden Perkins, 17, was behind the wheel of a Mazda 323 when it collided with a Hyundai i30 at Gemmels between Wistow and Strathalbyn – an hour inland from Adelaide - about 4.40pm on Tuesday.
His girlfriend, 18-year-old Mikayla Eastwood, was a passenger in his car and both died at the scene.
Amity Richardson, 17, Hayden's cousin. They were born within a month of each other.
"We were more brother and sister than cousins," Amity told 9News.
"We did everything together, went everywhere together.
"It'll never be the same. It'll always be different."
Mikayla's family remembered her today as "an independent, strong-willed young woman".
The couple had been dating for two years and had only just finished high school.
"They were inseparable for the last couple of years, they were very close and they were planning a future together so it's tragic," Mikayla's aunt Colleen Kluske said.
Family and friends of the couple have established GoFundMe pages to help cover funeral costs.
In just over 24 hours they have collectively raised more than $21,000.
"Planning a funeral for an 18-year-old is something that is not put in the family budget," Ms Kluske said.
"This is just going to give Mikayla the send-off that she deserves.
"One tragedy is hard enough.
"For two families to be experiencing the same thing at the same time, it is incomprehensible.
"It is just too hard to imagine the pain everybody is feeling."