Sisters Natasha and Chelsey Nelson launched their frozen yogurt chain just after learning that their mother suffered from a rare form of Parkinson's disease. "It feels surreal to be growing a successful business during the saddest time of my life," says Natasha, who adds that being open about her situation has made her a better executive. "I've learned you can't be a control freak when you are growing a company like this. I have gotten better about recognizing my limits and delegating."
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