I just had an idea:
What would it be like for a JW parent who has shunned their child for years, if when they call their JW child one day many years later and the ex-JW child pretended not to remember the parent or his former life as a JW?
"Who do you say you are? I'm sorry, I don't remember you. I have completely lost my memory of my past. The doctors say I must have experienced some great unbearable psychological trauma and my brain's way of dealing with it is shutting out my memory of everything from that point back."
If an ex-JW can pull this off and do a really good job of pretending not to remember them, surely that should cause the JWs to think of the great harm they have done to their child by following Watchtower's cruel shunning policy.
Also, how could a JW shun his child when the child isn't aware of why he's being shunned or what sins he committed and needs to repent of? How could they expect someone to show genuine repentance for something they don't recall doing? How do they wrap their conscience around that? lol