Child products from parent ID by store

Child products from a parent ID by store

 $storeId = Mage::app()->getStore()->getStoreId();
        $coreResource = Mage::getSingleton('core/resource');
        $conn = $coreResource->getConnection('core_read');
        $query = "SELECT * FROM catalog_product_relation AS c
LEFT JOIN catalog_product_website AS w
ON c.parent_id = w.product_id
LEFT JOIN catalog_product_link AS l
ON l.product_id = w.product_id
WHERE c.child_id = $childId AND w.website_id = $storeId AND link_type_id = 4
GROUP BY parent_id";