MY OPINION: I was born in a small family who had only one child, I always had all the privileges that others always first. Could not give a good opinion on this article because I never suffered like the first or like the  last.
But I have uncles that have more than one child there and see if they have any child preferenrcias with their year of birth in the family or location. I feel bad because all children are important, if some children deserve more careful but it is no reason to no-love the others.