After living in China for 16 years, I still need this graphic…
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The word I need is 嫂子/sao3zi. Thanks. 
Easy to remember as it has the same sound as 扫 which fits to her.
It does not make a difference whether it is my older brother’s wife or my husband’s older brother’s wife?
So 我丈夫的哥哥的妻子 can only be shortened to 我丈夫的嫂子. Right?
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Here the explanation in Mandarin
我老公的哥哥的妻子
我称之为嫂子/嫂嫂
我妻子的哥哥的妻子
我也称之为嫂子/嫂嫂
若有排行，加上排行即可，如二嫂（也可不加）
And in English: Yes you can can call your husband’s/wife’s older brother’s wife also 嫂子。You can add an 二,三，四等 in front of it two differentiate her from any other 嫂子 you might have.
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