In Father Tongue, Motherland, Peggy Mohan looks at exactly how the mixed languages in South Asia came to life. Like a flame moving from wick to wick in early encounters between male settlers and locals skilled at learning languages, the language would start to 'go native' as it spread. This produced 'father tongues', with words taken from the migrant men's languages, but grammars that preserved the earlier languages of the 'motherland'.

Looking first at Dakkhini, spoken in the Deccan, where north meets south, Mohan goes on to build an X-ray image of a vanished language of the Indus Valley Civilization from the 'ancient bones' visible in the modern languages of the area. In the east, she explores another migration of men 4000 years ago that left its mark on language beyond the Ganga-Yamuna confluence. How did the Dravidian people and their languages end up in south India? What about Nepal, where men coming into the Kathmandu Valley 500 years ago created a hybrid eerily similar to what we find in the rest of the subcontinent?

One image running through this book is of something that remains even when the living form of language fades-tucked away in how we think and speak now are echoes of our history, and the story of ancestors who lived hundreds and thousands of years ago.