Was it Lincoln who said that people are usually about as happy as they want to be?
If the sons are inclined to be satisfied, they will be. If not, no division of inheritance will please them, whether equal or unequal.
If you’re that worried, sell everything now and spend it.
Raffle and Chinese auction should not be ruled out either. ;)
That's my plan. The only thing better than dying with a zero balance is to owe someone a million bucks that you have already spent and enjoyed. ;o)