What is important is who one's social parent is. My grandfather growing up was not my biological maternal grandfather and I always knew it, but I loved him as if he was. He was "the grandfather" my grandmother was married to all of my life and for over 50 years of my grandmother's life. I knew who my maternal grandfather was and he was a yearly visitor, but I spend Christmas, Easter and Summer vacations with my step-grandfather and my grandmother. Corlee Ann Morris