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Little Sadie, 5, is grappling with the big questions at an early age. In this YouTube video, she heartbreakingly tells her family she doesn't want her little brother to grow up.

"He's so cute!" she sobs, giving him a hug. (And she's right.)

She's also thinking about just how short life is for all of us, big sisters included. "And I don't want to die when I'm a hundred!" she sobs.

Fortunately, little brother's cuteness just about saves the day, as he gives her a little smile and she can't help but give him one right back.

Read or Share this story: http://www.firstcoastnews.com/story/news/weird/2014/07/31/sister-loves-baby-brother/13397453/