Millions of people from Mexico's countryside come to the capital to build settlements and slums, adding to the ongoing expansion of one of the world's biggest cities. As part of our ongoing series, Al Jazeera's Adam Raney reports from Mexico City on families moving from the countryside to build better lives. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/