What about telling your girls to feel sorry for their grandmother? She’s of a different time an different era and she has had experiences that shaped her viewpoint. It’s sad that she feels that way about entire races of people she doesn’t even know. Old people need love and support because getting older is hard (it hurts!). Also, it’s confusing and hard knowing you are losing control over your health and your ability to improve your life and affect change. Maybe if you help them see things from their grandmothers’ perspective, they will be more empathetic.
" I object to violence because when it appears to do good, the good is only temporary; the evil it does is permanent." Mahatma Gandhi
"This is the ultimate weakness of violence: It multiplies evil and violence in the universe. It doesn't solve any problems." Martin Luther King, Jr.