YANGCHANG, China (Reuters) - In the mountain village of Yangchang in the backwater province of Guizhou in southwestern China, the roof of the Yang family home is cracked and about to cave in, held upright only by a few rickety tree trunks. Nearly penniless after quitting their jobs in a coastal city, Yang Hechun and her husband recently returned to the village to care for a sickly 71-year-old grandmother and two young children. "We can hardly afford to eat, never mind mend our house," said Yang, over a meal of rice, chilli bean sprouts, peanuts and tofu. ...

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