If Leia loves her brother Luke, does she feel sisterly love (because she is his sister) or brotherly love (because he is her brother)?
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She would feel a "sisterly love" — the love of a sister — for her brother. A mother feels "motherly love" for her children, etc.
The reason for possible confusion stems from the use of "brotherly love" to describe in a general way the love of human beings for each other, similar to the way "mankind" also includes women.