Is it considered usury if a family sends money to India by depositing it into the account of a man who contacts a colleague of his there to bring the money in rupees?

Currency exchange falls under the category of "Sarf" (currency exchange), and for it to be valid, immediate mutual possession between the transacting parties or their representatives is required. If it is possible for your family to receive the amount immediately upon its handover, then this is Islamically obligatory. However, if it is not possible, and no other method is feasible, then this method is permissible due to necessity, which is to be estimated according to its true extent.