If you’re lucky enough to have a sibling with whom you’ve shared years of secrets, squabbles, laughter, and love, you’ll get a kick out of this.
![gratitude-equals_health-buick_twins](http://www.raisingjane.org/journal/wp-content/uploads/2011/09/gratitude-equals_health-buick_twins.jpg)
Twin sisters, ca. 1911. Photo courtesy of Wikimedia Commons, Bain News service photo via Library of Congress