With the emphasis on 'did,' I would assume that the grandfather was still acting like he hadn't done enough and, "I did everything that you asked me to," is the rebuttal to that. Sort of like this scary Asian dad that my wife encountered on the subway once (yelling at his ~7 year old kid):
This is not perfect! It must be perfect! Not 80%.
Not 90%. That's not perfect! Must be perfect!