My mom is hurt I'm not seeing her for mother's day

My mom really wants me and my daughters to come see her for Mother's Day. She is upset we never see her anymore. I don't see her much since she moved my Nana in. My Nana is old and has no one in her life besides my mom because she's an old racist bitter woman. And my children are half black. My husband is black. The last time we ever spoke to my Nana she told me she still can't believe I married an N word and hope if I have kids we use a donor because she doesn't want n word great grandchildren. So I decided my husband will no longer be exposed to this. My children wouldn't be exposed to this. My mom uses the back in her day excuse and I do no black people or people from any minority should have to put up with people like that just because they don't wanna change. You wanna be the same racist bitch you always were? Then she can't complain that she has no one. I'm not exposing my daughter's to that. My mom already tells me the horrible disgusting racist shit her mom says about my husband and our kids even though I don't wanna hear it. I won't be around her. My mom says she just wants all the generations of Parker women together. I'm not doing this. I'm not putting my black kids through racism