Here are concrete plotlines you can adapt:
The person who married into the madness. Their role is the audience surrogate. They look at the family traditions (the annual fistfight, the secret vault, the passive-aggressive toast) and ask, "Is this normal?" The outsider either saves the family or gets crushed by the machinery. Tamil Incest Sex Talk Audio
Someone is not the father. A child was given up for adoption thirty years ago and lives across the street. A parent is actually a sibling. Here are concrete plotlines you can adapt: The