Read JSON data with Python

The json module (docs.python.org/3/library/json.html), part of the Python Standard Library, is a JSON encoder and decoder. We will use it to read JSON-formatted data.
If the JSON-formatted data is stored in a file, use the load() method. If you provide a JSON-formatted string, use the loads() method.
The decoder translates JSON objects into Python dictionnaries and JSON arrays into Python lists.

Exercise: given the following JSON string that represents a family tree, write a Python program that prints the names of Charly's children.