The Flying Doctors (1986) : 1x3

An english family, the Robertsons, arrives in Coopers Crossing, looking for work. They get a tip that a farmer outside town needs workers so they decide to go there. However, they get lost, and have to stay in the car over night. The next morning, the man goes for help and tells his wife to stay near the car with their two sons, Alfred and Alexander, and babydaughter. It is incredably hot and mr. Roberson gets dehydrated and finally collapses. Since the family didn't show up at all at the farm where they were expected, a search is organized. They find mr. Robertson, and he will be ok. At the car, mrs. Robertson has been really angry with the two boys and they run off. When they want to go back they discover they are lost. The search party manages to find the car where mrs. Robertson is very worried about her sons. Eventually the two boys are found, but too late - one of them died of dehydration.