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We are sisters.
Watashi tachi wa shimai desu.
Pro-Japanese Canada Local time: 11:13 Native speaker of: English PRO pts in pair: 23
Explanation: "shimai" is correct. However, the Japanese language tends to be very specific and hierarchical. Normally you would indicate wether your sister(s) is/are younger or older than you. Such as "she is my younger sister": "(watashi no) imoto desu" or "she is my older sister": "(watashi no) ane desu". You would use exactly the same expressions if there are more than one older/younger sister.
Japanologist with many years in Japan
DPS Australia Local time: 05:13 Native speaker of: German