Grave of the Fireflies (1988)

The most devastating sibling film ever animated, and not one for a casual evening. Seita, fourteen, tries to keep his little sister Setsuko alive after the 1945 firebombing of Kobe, and every small kindness he manages, a tin of fruit drops or a jar of fireflies, is shadowed by what he cannot provide. Isao Takahata's Studio Ghibli film adapts Akiyuki Nosaka's semi-autobiographical story, drawn from his own sister's death. Watch it when you are ready to be wrecked, then call your siblings.