While we are not given a direct description of Gretel's appearance in the novel, here are some details about her character that may help to form an image of Bruno's older sister for you:
In John Boyne’s novel The Boy in the Striped Pajamas, in addition to being repeatedly referred to by her brother Bruno as a “Hopeless case,” and, at the beginning of Chapter 3 as “nothing but trouble,” Gretel is further described in that chapter as Bruno’s older sister by three years, as the following text from the book demonstrates:
“Gretel was three years older than Bruno and she had made it clear to him from as far back as he could remember that when it came to the ways of the world, particularly any events within that world that concerned the two of them, she was in charge.”
As Bruno is described in this chapter as being nine-years-old, that, obviously, makes Gretel 12-years-old. While Bruno clearly chafes at life under the domineering...
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