I can't see anything but an equal split. Not so rich that the money (when split 4 ways) will allow them to do nothing unless they go the Mr Money Moustache route and they won't likely get it until they are 50s or later. They are all still in school but we can see even now that there are likely to be differences in affluence among them. Hopefully they have been brought up well enough to help one another if the need arises. Some have alluded to that here. My mother plans an even split of her modest estate even though there are significant differences in the means of her 3 children. None are particularly poor though. I'm sure that she figures we will look out after each other as the need arises.