Between a parent and child, if it's the daughter who gets treated that way and raises her voice, she exposes this reality to the world. But between mother and son, both parties benefit, essentially a win-win situation, so they share the secret and don't tell anyone. It's literally a secret affair taken to the grave. But looking at it another way, it's an insatiable older woman and a young man in his prime. I think there are quite a few like that…
