Magento Get the parent of a simple product

This tutorial will guide you on how to get parent product id for simple product in magento. There are several ways we can achieve this.

$parentIds = Mage::getResourceSingleton('catalog/product_type_configurable')
->getParentIdsByChild($product->getId());
if (isset($parentIds[0])) {
    // If we find a parent product then we display it's ID
    $parentProduct = Mage::getModel('catalog/product')->load($parentIds[0]);
    echo $parentProduct->getId();
}

OR

$simpleProductId = 102;
$parentIds = Mage::getResourceSingleton('catalog/product_type_configurable')
                  ->getParentIdsByChild($simpleProductId);
$product = Mage::getModel('catalog/product')->load($parentIds[0]);
echo $product->getId();

Best of luck