Jeff Bezos' mother, Jacklyn "Jackie" Gise Bezos, died on Thursday at the age of 78 after a long fight with Lewy body dementia, a brain disorder that can affect thinking, movement, behavior, and mood.

The Amazon founder announced the death of his mother on social media , saying that he and his family "were all so lucky to be in her life."

"Her adulthood started a little bit early when she became my mom at the tender age of 17," the 61-year-old billionaire wrote on Instagram. "That couldn’t have been easy, but she made it all work."

"She pounced on the job of loving me with ferocity, brought my amazing dad onto the team a few years later, and then added my sister and brother to her list of people to love, guard, and nourish," he continued. "For the rest of her life, that list of people

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