If you want to have many children, but counting on the older ones to help out with the younger ones, maybe don’t have many children. Older children are not there to bear the responsibility over their younger siblings. The fact that they are the oldest shouldn’t affect their own childhood, and they shouldn’t be expected to ‘help out’ just because they are there. They are children just as much as their younger siblings, and to put it as simple as possible–it’s just not fair.