My grt grandparents were first cousins. I do Pedigree/Ancestor Charts from my grand mother a child of the first cousins and do not have two charts. So I don't have a problem. Do a chart from a child or grand child and see what happens.
Went back and set up Ancestor Charts from my grandchildren and yes it does set up separate pages. But I do not think that is a problem at least for me. AS I very seldom use the Pedigree/Ancestor Chart unless it is for a special reason. My index for my hard copy/electronic files is the Family Group Sheet for each person.
My comment is not to worry about dup copies for those brothers. Mine are sisters and in their parents file, the FGS tells the story. In their spouse files, the FGS tells the story.
I always ask my self before making a copy of any chart, Why? What for ____? Which chart is the best? Do I really need it?