The reasons for the taboo surrounding incest are complex and multifaceted. Some of the concerns include:
Family drama endures because the family endures. As society changes—as marriage rates drop and "chosen families" rise—the biological or adoptive family remains the primary source of our deepest joys and most acute pains.
Families forced together by external crises, such as poverty or illness, must navigate their internal conflicts while fighting to stay afloat. 3. The Psychology of Complex Relationships