https://www.scientificamerican.com/article/family-estrangement-why-families-cut-ties-and-how-to-mend-them/

Family estrangement is one of my most requested topics from listeners and readers coping with the loss and isolation they feel when someone cuts family ties. In a way, the grief of family estrangement can be more painful—or at least more complicated—than the grief over a loved one who has died. When a family member voluntarily walks away, you may miss them and feel confused, ashamed, frustrated, and disappointed, especially if the hope of reunification is dashed. 

So why do people excommunicate their family members? Are there any ways to cope or remedy the situation?