National Siblings Day is a celebration born of love — and grief

While not an official holiday, National Siblings Day on April 10 has gained momentum on social media in recent years. (Diana Haronis/Getty Images)

Every April 10 for several years now, many social media feeds are transformed into a virtual family album of sorts, as friends and acquaintances post photos to mark National Siblings Day.

But unlike many of the unofficial holidays that clutter the calendar year — from Talk Like a Pirate Day to National French Fry Day — National Siblings Day is neither frivolous nor commercially motivated. Instead, it is a holiday born of profound love — and loss.