A simple script to get all siblings of an element.

get-siblings.js

/**
 * Get siblings of an element
 * @param  {Element} elem
 * @return {Object}
 */
var getSiblings = function (elem) {
    var siblings = [];
    var sibling = elem.parentNode.firstChild;
    var skipMe = elem;
    for ( ; sibling; sibling = sibling.nextSibling ) 
       if ( sibling.nodeType == 1 && sibling != elem )
          siblings.push( sibling );
    return siblings;
}

Shorter, sure. Better? Subjective.

I should update this to use filter(). But arrow functions and spread operators are going to severely limit browsers that can use your approach.