I've had this dream of a nonexisting family for 13 years, why is that?

In my dream their entire family doesn't have ANY boys. A mother of four girls that has retired from her service in the army. She also has four granddaughters. They live in my dreams as if it was a regular life on earth. Its always good things happening with this family. The mother is very masculine and over protective of her family. She is also very wealthy. From the first day it started when I was about ten, this family has grown with me even today. I can actually describe each family member, but I've never seen them. They are known to me as the Johnson family. Do anyone know why I have this type of dream every single day, for over ten years.