After three years of probe, CBI on Thursday filed a charge sheet against the two sons of former Haryana Chief Minister Om Prakash Chautala in a disproportionate assets case. It is awaiting a nod from the state assembly Speaker to charge the father as well. A CBI spokesperson said, the charge sheet was filed in New Delhi in the designated court against Ajay Chautala and Abhay Chautala for allegedly having assets 339 per cent and 522 per cent more than their known sources of income. <br/> <br/>