Narrative interest develops from the profoundly differing views the siblings have of the parents.
The older, spoiled daughter, say, views the absent father with admiration bordering on worship. The younger, abused son views him as near-psychotic tyrant. Conversation reveals that the daughter, either through repression or ignorance, has no present knowledge of the father's long-ago violence toward the son and, perhaps, toward the mother. Nothing new there. All in all, the standard stuff of soaps as well as the seed from which great art may grow.