Newspaper articles use different approaches to first grab a reader's attention, then sustain it with useful or information or interesting details. Repetition of information is frowned upon, not unless its necessary to emphasise a point. But a reader need not be reminded that brothers are brothers.
At first mention, there's no harm in stating that the key subjects in this particular story are related.
For what it's worth, the writer should perhaps not be heavily faulted for establishing who is the younger or elder brother of the central figure in the story.
But to shortly afterwards re-state that the younger, elder, and key person in the story are brothers, is pushing it too far.
Oh brother! We get it, they are brothers.