Not suggesting it is cheap but how do you arrive at over a half million dollars?
Annual cost at Ivies is currently $80k to $83 per year.
So total of $320,000 to 332,000 assuming no need based aid at all. Even with some YOY increases you don’t approach $500+k.
OP have you talked finances with your parents? They are the ones that should be driving the money discussion not us strangers who don’t know the totality of your situation and or families ambitions and circumstances.