Sibling Rivalry

Some family members are "born into" more privilege than others. Parents shouldn't, but often act as though they have favourites. Firstborns are often entrusted with the most leadership. The babies are often showered with the most privilege. (The middles always get forgotten. Always.) Yet, somehow they are all supposed to be family, especially within the family of faith. So how do we do that? How do we live together given that we are all so diverse, given that some of us are more privileged than others?