Bo and Luke Duke? Where were their parents? They had an uncle.
In Dune - which you could write a whole series of articles about - the teen boy hero loses his father early on in the story. So depending on which version you follow you get
book: Mature boy turns into mature leader with very little childhood
movie 1: ditto
movie 2: super whiny childish boy turns into arrogant obnoxious leader
However he at least does have a mother, although she turns into a helpless follower in that movie #2
Lord of the Rings - is it fair to call the four hobbits the "boys" of the story, both because they represent them with their childlike ways and also because they're short and visually connect with our idea of what boys are like? Each hobbit has a distinct personality and represents an aspect of boyhood ... but none are ever shown with parents
Only ... an uncle! Bilbo the uncle! Aha, back to our uncle theory.