If this person is truly narcissistic as the title states, then the call for unity at the end is simply a method of playing the victim. And I’m inclined to believe the title, since his child has gone no-contact. Because going no-contact is often the only way for children of narcissists to begin improving their own mental health after growing up with a narcissist for a parent.
If there’s one thing narcissists love, it’s turning things around on their victims. They always want to control the narrative to be the victim. Given that context, the call for unity rings hollow. Because it could easily just be a way for the grandfather to flip the script and paint their child in a bad light. It allows them to go “hey I’ve been trying to reconcile and they have refused.” But what the people reading this post wouldn’t know (especially if they’ve only seen the grandfather’s side) is that the child has been refusing because every time they have tried in the past they have been burned.