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The thought of Sokka and Katara being sisters is actually really interesting. Sokka would be encouraging her younger sister to be more like her and stop messing around with that bending crap, be more like a typical water tribe squaw. Also the playing field would be more level so she wouldn't have to put up with her younger sister's physical abuse like boy Sokka.
It could better highlight the contrasts between the two. Sokkara is still smart and bizarrely charismatic as ever and gets the most attention from boys. Katara is still strong-willed and compassionate, a real mother type. Being sisters, they would more directly compare themselves to each other and each would admire, maybe even envy, the qualities she sees in her sister that she lacks herself. Of course in the end they always support each other.
