I think if dadaji had revealed it before Dev would have been in danger. But,then I feel sorry for Dev since he had to stay as a servant & had to go through hell. Dadaji could have said that he was some relative's son & his parents are no more.That would have still been a better option & he wouldn't have been under so much obligation.
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very interesting this step in the show, sure Dadaji wanted to protect Dev from all the evils and of course to protect the function Raj Purohit and the family