Walkabout (1971)

"A boy and girl face the challenge of the world's last frontier."
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Under the pretense of having a picnic, a geologist takes his teenage daughter and 6-year-old son into the Australian outback and attempts to shoot them. When he fails, he turns the gun on himself, and the two city-bred children must contend with harsh wilderness alone. They are saved by a chance encounter with an Aborigine boy who shows them how to survive, and in the process underscores the disharmony between nature and modern life.

Luc Roegas White Boy
David Gulpililas Black Boy