The accident took place on the highway linking Nanning, the regional capital, with Qinzhou.
A Mercedes with no license plate collided with the minivan. Without putting out any warning signs, the two drivers stopped on the highway to take pictures and argue.
A truck then hit the minivan, causing the casualties, state-run Xinhua news agency reported.
There were 13 people in the minivan, including 5 children. The truck had two persons on board.