Timoti's sister, Robyne Timoti, said they didn't blame Castle, who went to her brother's tangi and 23rd-birthday celebrations at his grave site in Haranui, near Helensville, in April.
"I don't blame anyone. It was sad and just an accident," Robyne said.
"We miss him. They had a good time at his birthday and Rawiri was there."
She said the family suspected a spacesaver tyre blowout contributed to the cause of the accident and warned it could happen to anyone.
Despite his rebellious attitude towards driving, she said Timoti was a cheeky, funny boy who loved music, fishing and going to church.
"He had a good heart. Everyone has their faults, he was just a boy who was looking forward to the future."
Castle is due to appear in the Waitakere District Court on September 13.