Pimcore\Model\Document::getSiblings PHP Method

    public function getSiblings($unpublished = false)
    {
        if ($this->siblings === null) {
            $list = new Document\Listing();
            $list->setUnpublished($unpublished);
            // string conversion because parentId could be 0
            $list->addConditionParam("parentId = ?", (string) $this->getParentId());
            $list->addConditionParam("id != ?", $this->getId());
            $list->setOrderKey("index");
            $list->setOrder("asc");
            $this->siblings = $list->load();
        }
        return $this->siblings;
    }