In multichild families of 2 children &/or more, children oftentimes have to vie w/each other for parental time, attention, affection, & resources. Children in multichild families also have the feeling of being dethroned in favor of a sibling or siblings. There is a very high incidence of favoritism in multichild families in which some children are treated preferentially while others aren't. Some children in multichild families are even viewed as disfavored or even scapegoated children. There is a tendency of unequal treatment in terms of parental time, attention, affection, & resources in multichild families.
In multichild families, children are seldom valued for their individuality. They are oftentimes compared to each other & taught to blend in. In multichild families, children are inculcated w/a collectivist mindset. In multichild families, children aren't allowed to assert themselves as individuals.
In multichild families, children are designated into rigid roles which will negate their individuality & create a self-fulfilling prophecy mindset in the eyes of parents & other siblings. In such families, children are either the smart/stupid/slow/retarded one, the beautiful/handsome/pretty/plain/ugly one, the golden child/black sheep/persona non grata one, or any other familial designations which psychologically, even psychically affect children in their formative years & beyond.