[11] Claudia Evart, a native New Yorker and resident of New York City, founded the Siblings Day Foundation (SDF) as a tax-exempt organization.

Notable individuals such as Senators Edward Kennedy, Chuck Schumer, Hillary Clinton, and Karen Gillibrand, seven White House cabinet members, three New York mayors, the Manhattan Borough President, various state and local elected officials, celebrities including Oprah Winfrey, and siblings across America have also commended the Siblings Day Foundation.

[14] Siblings Day has expanded internationally, with fourteen countries including Australia, Brazil, Canada, Ghana, India, Ireland, Japan, New Zealand, Nigeria, the Philippines, Singapore, South Africa, Sweden, and the United Kingdom either continuing or adopting the celebration since 2014.

[15][16][17][18][19][20][21][22] Siblings Day has gained attention through its coverage in various media outlets including CNN, Voice of America, International Business Times, and YouTube's global blog.

[24][25] The siblings' day is celebrated across European countries:[26] Austria, Cyprus, Croatia, Czech Republic, Estonia, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Portugal, Romania, Serbia and Switzerland.

[30] Non-material examples of observances during this day includes giving hugs to your sibling(s), enjoying time with them, honoring their presence in your life, and greeting them on various social media platforms using childhood photos.