The Fourth Wish (1976) - Australian Movie

Casey learns that his 12-year-old son Sean has leukaemia and will die in a few months. Casey leaves his job to devote himself to making his son happy, seeing to grant three wishes of Sean: to own a dog, be reunited with his mother, and meet the Queen. Based on a three-part 1974 TV drama. Starring John Meillon, Anne Haddy, Michael Craig and Ron Haddrick.