Scattering flowers, lighting clay lamps, drawing colourful rangoli on the floor, Parteek Mittal and Kanu Aggarwal are putting the final touches to their Diwali celebrations. The Australian government would not allow "unaccompanied minors" to travel to Australia — tearing Aarya and his family apart. "We were regretting our decision to leave him in India every day," Mr Mittal said. And, …