What is the story behind the arrival of the two orphans to the farm?

A tribe was in a camp. Among them was a woman who had just given birth to a son, and her daughter. The mother died of a snake bit. The tribe buried her and the infant son as was the custom, while the girl hid in the bushes. When the tribe left, she rescued her baby brother and a government truck driver took them to Nyanyabwe Hospital. When they were released from the hospital, they lived in the yard of one of the nurses. When the nurse's husband was transferred, the children were sent to the orphan farm.