I am 24 years old, will be 26 by the time my wedding comes around. My two younger brothers and I were raised by our grandmother. She has done everything for us and has been there through thick and thin for me. My mother has never really been a part of our lives, due to an ongoing drug addiction, but I do have contact with her. We talk maybe once a week, sometimes more and sometimes less. What is the mother of the bride's purpose in the wedding? Would it be wrong for me have my grandmother take my mother's place in that role? Do I even have to invite her to wedding?