Aurangzeb wasn't the choosen king. He forcefully grabbed the throne. In order to do so he needed the services of some of the Hindu generals. These Hindu Rajput generals had a large following of Military under them. Most of these Hindu Rajput Generals Grandpa's had been working under Akbar. Aurangzeb knew that he needed the support of these powerful Rajput Generals in order to establish himself as a king. Most of these Rajput Generals worked for Akbar who had established marital relations with these Traitors.
Once firmly established as a king - the methods he used to finish off these Generals is pretty well known.
