I am a biual young girl and im confused...?

im confused on how to tell my mother, her wife and my grandparents, i have no problem telling my already mother, but my grandparents, ohh them, they are gunna be my worry, when my mom said she was getting married to a woman my grandfather asked himself were did we go wrong, and my grandmother didnt talk to my mom for like 2 weeks, idk if they are gunna do the same with now having a biual daughter and granddaughter... what should i do?