Narcissism has different levels, one shoe doesn’t fit all. Many people say two narcissist cannot work together. However as an outsider both the codependent and the narcissist can look the same. The cycle continues and both can eventually look as bad as each other consistently holding on to what is toxic. Often doing what they think is best for the family by staying together. Not ever getting better but worse overtime. Dragging others into the webs they weave to anyone who will listen.
Cultural norms can become the scapegoat for this behaviour. Making those that question their reality seem crazy
You, however, continue in the things you have learned and become convinced of, knowing from whom you have learned them, 2 Timothy 3:14