Kevin Franke opens up to PEOPLE and in Hulu’s new docuseries, 'Devil in the Family: The Fall of Ruby Franke,' streaming Thursday, Feb. 27

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Kevin refused to reveal what Ruby wrote to him. “I'm not going to share,” he told People. “That's between her and me. But it just didn't feel right and it didn't feel good, and I'm very angry. I'm still very angry.”