jquery.pruneSiblings plugin - takes a selector and walks up the dom tree (until reaching a body or html tag), removing siblings along the way.

jquery.pruneSiblings.js

/*globals jQuery */
(function ($) {
  'use strict';
	var prune = function (orig, item) {
		var parent = item.parent();
		item.siblings().remove();
		if (parent.length > 0 && !parent.is('body') && !parent.is('html')) {
			return prune(orig, parent);
		}
		return orig;
	};

	$.fn.pruneSiblings = function() {
		return prune(this, this);
	};
}(jQuery));