Looking for the title of a movie from the 70s about a girl, her younger brother and their father who get stranded on a deserted island. The father dies and the kids row out in a small boat and dump his body in the ocean. Don't remember anything more about it anymore. Any ideas?

Just a shot in the dark.. but.. could it be The blue lagoon? It was made in 1980

Good try, but they guy was not their father and the boy and girl were not related

Good try but it's not that one. I saw this movie in spring of 1976 on TV.