A dream including your dad is likely a comment on your relationship with him and how it is holding you back in some area of your life now. Dreams only focus on problems in your life. Although you may have had a wonderful relationship, there are still often traits or attitudes you copied that you could do without.
To dream of your dad dying is not a warning about his death. Rather it asks you to let some negative aspect of yourself die so that a more positive one can find expression. The negative aspect is connected with your dad. You either copied or developed it as a result of your relationship with him. It does not matter if your dad is already dead or you have not seen him in many years. It is the effect you are carrying today that is the target of the dream. Male energy is affected by your relationship with your dad and gives you confidence, belief in yourself, creativity, individuality, various spiritual gifts and more. The dream can be about any of these.