A narcissist parent may not be as supportive to their children or child like a regular parent would be.
But that doesn't mean that the narcissist doesn't love their child or children even though they might not show the love as much as other parents who are not narcissist.
Narcissist parents also usually have high expectations of their children although they are not very supportive of their children.
A narcissist can be a very good parent but some are not just like anyone else that may or may not be a good parent.
The personality disorder narcissism can be treated but there's no cure for narcissism.
When a person has narcissism they can be treated using therapy and counseling and some medications they can take can sometimes help to manage conditions such as depression or anxiety that often accompany the narcissism.
But there's no cure for the narcissism when someone has it.
Therapy and the medications can sometimes help a person with narcissism but there's not guarantee that the therapy, counseling etc will help the person who has narcissism.
If the person with narcissism wants to change their ways of being a narcissistic then that can happen but the person has to want to change as no amount therapy or medicine will cause the person to give up their narcissism ways.