To win any child custody battle, you must be able to prove that your child is better off living with you than with his other parent. In the case of a narcissistic father, you'd want to prove that his narcissism is severe enough to affect your child's emotional or physical health and well-being. People with severe narcissistic tendencies can be overly critical, self-concerned or lacking in empathy, so you should be able to use a narcissistic father's traits to prove that he can't provide a good, loving environment for your child.
Document Everything and Gather Witnesses
Write down specific incidents that have occurred displaying the father's narcissistic tendencies. Get other people to attest to those incidents in written statements. The more written testimony you can gather that shows how the father's narcissistic behavior negatively affects your child, the stronger your case will be.
Ask others who have seen your father's child behave poorly toward him to come to court and testify on your behalf. They should be people of good moral character who have been around you, your child and the father of your child.
Document Your Own History With Your Child, Too
Begin keeping a record of the time you spend with your child. Include school activities, general errands, medical checkups and other things you regularly do for him. Show how your involvement in your child's life is greater than that of his father, which will likely be the case if the father is a narcissist because these people tend to be more concerned with themselves than with anyone else.
Enlist the Help of a Professional
Make an appointment for your child with a counselor. A narcissistic father is likely to have been critical or emotionally immature, and a children's counselor can help your child express her feelings about this. The counselor can also testify in court about what he believes is the best custodial choice for your child.
When the Court Becomes Involved
Be timely and prompt with any and all documents requested by the court. Don't call the father names or be condescending toward him in any way. Hold your temper, particularly when you're in court. People with narcissistic tendencies have a difficult time relating to others, and it is important that you show your maturity when you're in front of the judge. It will contrast with his lack of maturity.