The Flying Doctors (1986) : 6x5

Two girls, Kelly and Hannah, and their grandmother have a car accident. In hospital Geoff finds out the grandmother has lethal cancer. She wants to looks for the girls' father, Michael O'Connor, their mother is dead. Geoff locates Michael on the opal-fields, but Michael won't come back. The grandmother dies, and the girls overhear Geoff when he says they might be split up. The girls run away and a search-party is organized. Geoff has found out why Michael won't come back for his kids, and confronts him with the information. This makes Michael come and look for his girls and thanks to him they are found!