The Kardashians, Knowleses, Cruzes, and Simpsons do it — they're sisters who love each other so much, they're in business together! In honor of National Sisters Day on Aug. 4, we're looking at why, and how, these sets of siblings mix family and finances whether in the fashion, music, or television businesses. On Allie: Forever 21 top, Zara blazer, and Levi's jeans.
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