This is where things get very scary. Since this NPD is only looking out for numero uno (themselves), they may neglect the children completely.
At best, they leave their kids in the care of nannies or of other functioning adults, and at worst – all out neglect.
At an early age, these children realize they are on their own in this world, and they must take care of themselves, and any younger siblings.
They learn that the parent is basically useless and cannot be relied on. These children literally take life into their own hands. They can become resilient, resourceful and strongly independent.
When they become adults, they realize that their childhood made them mistrustful and it can be hard for them to get close to people. The ones who had to take care of younger siblings too usually never want children of their own.