It's National Siblings Day on April 11th.
More on Siblings Day and the other days on the 11th below.
We detected 18,107 references to national Siblings day on 11th the April. There were also a total of 55 other national days mentioned including: Pet, Sibling, Committee and Former Prisoner Of War Recognition Day.
The day shown for 'National Siblings Day' is shown as we detected that day mentioned the most out of all the references to national days there were on April the 11th across social media. Our algorithms examine all of the references to National Days across social media and updates whatnationaldayisit.com hourly, with our homepage displaying the current national day. This crowdsourcing of data method to assess the National Day date is used as opposed to being connected with any Government sacntioned lists :D Hurrah for democracy by concensus!