A 14- and 9-year-old brother and sister pair are in the headlines today as they made over $30,000 a month mining crypto assets. According to Aanya Thakur and her brother Ishaan, they mined three types of digital currencies like Bitcoin (BTC), Ethereum (ETH) and Ravencoin (RVN). The Thakur siblings have also established a mining firm called Flifer Technologies with the help of their Dad.