Adorable 5 Year Old Really Doesn't Want Her Baby Brother to Grow Up

Video of a five-year-old girl from Phoenix, Arizona, sobbing at the thought of her three-month-old brother growing up is going viral on Reddit.

Decked out in a Princess Sofia dress, Sadie wraps her arm around her little brother Carson, kisses his head, and says at one point, “He’s so cute, and I don’t wanna die when I’m a hundred!” Her brother just smiles, clearly amused by it all and loving the attention.

“She’s cried about not wanting to get older herself in the past, but this was the first time she was upset about her brother,” her father Ryan Miller said in an email statement provided by his brother Alex Miller, who uploaded the video to YouTube. “The funny thing is that this was totally out of the blue — we have no idea what prompted it.”

And to show you how devoted Sadie is to Carson, here’s a photo of the girl reading to him:

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Write to Olivia B. Waxman at olivia.waxman@time.com.