Because older siblings often have to help parents look after the younger ones, it's acceptable to have the Older First rule to instill heirarchy. In return there has to be responsibility, otherwise ot is mere exploitation and taking undue advantage. That's where Baby First comes in.
The problem is when this sets into a sense of unearned entitlement in adulthood. Then no fair.
The problem is when this sets into a sense of unearned entitlement in adulthood. Then no fair.