What is the sweetest sibling story you've watched onscreen?

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I know it's a bit childish, but "Frozen" totally had me in the first look. Not only the sisters are adorable, but the film also provides a subtle analysis of origin of mental illness. and I totally love the fact that Disney, the teller of prince-and-princess-love-stories chose sibling bonding over romantic kiss as "an act of true love". I was awestruck by the end ! What's your favourite? Let me know, I'd love your recommendation. here's a picture of me (!) being "frozen" in "oh my disney !"