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From Wikipedia, the free encyclopedia. Siblings Day (sometimes called National Siblings Day or National Sibling Day) is a holiday recognized annually in some parts of the United States on April 10, honoring the relationships of siblings.
Unlike Mother's Day and Father's Day, it is not federally recognized, though the Siblings Day Foundation is working to change this. Since 1998, the governors of 49 states have officially issued proclamations to recognize Siblings Day in their state. From its American beginnings the observation has become international, spreading as far as India and Australia.