Your best friend could be your mother or your father. Or even your grandparents. Your best friend could be a relative that was nice to you while you were growing up. Who ever your best friend was it is always nice to have a best friend in your life.
The best friend that you grew up from kindergarten with. Could still be your best friend thirty or forty years later. Best friends are great to have in your life. They are great to have and do things with.
Two of my best friends died with in the last few years. One had the health problems since the day he was born and the other one never took care of his health. My brother who was my best friend died over year ago and I still miss him to this day. He was also my best friend and brother.
So whoever is your best friend. You need to cherish them and do not forget about them as you get busy with your own family. Your best friend will always be there when you need them.