Thirteen-year-old YouTube star Caleb Logan Bratayley died last month from a rare heart condition, his family confirmed Tuesday.

In an emotional Instagram post, his family shared the cause of Caleb’s death, which had remained fairly vague until Tuesday. The post has been liked more than 70,000 times by devastated fans of the Bratayley family —which includes his mom, Katie; his dad, Billy; and his two sisters, Annie, 10, and Hayley, 7— who have almost 2 million subscribers on YouTube

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YouTuber Caleb Logan Bratayley died from heart condition, family says