That's just not the case - if you assume he bought in during a low point you'll get a much higher figure. Besides, there's no claim that he was given anywhere

That's just not the case - if you assume he bought in during a low point you'll get a much higher figure. Besides, there's no claim that he was given anywhere close to $400M over 60 years ago, nor can anyone be realistically expected to invest their inheritance starting at the age of 12.