The family as a system
Families in fiction work best when they are written as systems rather than as collections of individuals: each member occupying a role that the system has assigned or that they have settled into, with behavior that maintains the system's equilibrium even when it damages the individuals within it. The scapegoat, the golden child, the peacekeeper, the one who got out — these are not cliches if they are written from the inside, if each role is inhabited by a person who has specific reasons for occupying it and specific costs from doing so. The system's structure should be visible to the reader before it is visible to any of the characters, and the drama often comes from the moment a character begins to see the structure they have always lived inside.