NEVER use this low level stuff to access your nodes.
The official API is to use FlowQuery, like this:
$context = $this->contextFactory->create(array('workspaceName' => $workspaceName, 'dimensions' => $dimensions));
$node = $context->getNodeByIdentifier('0036abe7-1f50-43a9-a835-5ecc24332075'); // Use the identifier of the node at path /sites/website/node-56a5b4a7a127c, prefere UUID because they never change
$query = new FlowQuery(array($node));
$query = $query->children('[instanceof TYPO3.Neos.NodeTypes:Page]');
$nodes = $query->get() // Should return an array of Nodes
You need to create a context with the correct workspace and dimensions. From the context you can get the node by identifier (don’t use the path because the path can change). You can get the node identifier from the inspector.
Once you have the node with the correct identifier, you can use the FlowQuery to select the node that you needs. I edit the FlowQuery bellow to get all the children Page
Don’t write in a three year old thread, but create your own topic with a saying title. That will also help others in the future, searching for a solution to the exact usecase.