text: wear earplugs whenever you get in hearing distance of him and just smile wide, and if you see his lips moving, just say "I think you are too.", either way it has to be a positive comment or an annoying but powerful comeback.\n\nanother approach is to avoid him & ignore him until he realises that he is not wanted. he will leave you alone, and if he starts calling you names tell him that you have bettter things to do than listen to him time-consuming lectures on your own inferiority. old people get pissed off when you use big words.\n\nalso, you might want to group together with your mom to solve the problem, because she has power in the household, and both of you together might convince your dad to talk to your grandfather. \n\ni hope this advice helps because i have the exact same problem, i don't get what it is but grandfathers on your dad's side are really mean to you some times if you are a girl. Hope this helps! Good Luck!