His dad should’ve told him that he was getting nothing when he was alive.
Many people feel entitled to their family members’ money. We all know someone who thinks that they deserve thousands of dollars from their grandparents upon their passing, even though they made no effort to have a relationship with them when they were alive. The best way to approach the possibility of receiving an inheritance is with a neutral attitude. If you don’t get an inheritance, that’s okay because it was never your money to begin with, so you didn’t lose out on anything. If you do get an inheritance, that’s cool too, but at the end of the day, you’d rather have that person still be alive than have their money. It makes you want to use their money in a way that honors them, rather than wasting it on something of little value.
If you’re planning your will and you’re going to give one kid everything and the other kid nothing, you should at least give the kid getting nothing the dignity of knowing this before you pass away. A lot of people won’t do this, leaving the sibling in a guilty position, feeling obliged to give their sibling money, even if that was not their parents’ wish.