I saw the recent Louis Theroux documentary - the girls secretly don't believe in white supremacy, one of them said to Louis when it was just the three of them: "I don't think I'm even a white nationalist like my mom", but the mum is pretty overbearing and still believes in it. They are trying to write more girly poppy songs rather than the usual white power stuff as well. Their mum's father comes across as a violent loon, I don't think it's something you can get away from easily. I vaguely remember the older Theroux documentary but I was quite young when it came out.
She had them talk to ( I can't remember his name but he was a really old KKK'er in prison for murder who's died since) on the phone and he was saying really disgusting pervy things to them but the mum didn't care.
She also made them move to Montana or Vermont or somewhere like that because there were "too many black people" in California but when they got there the people didn't want them there and put flyers everywhere
I hope they go to uni away from her because they seem like they could grow up to be nice people and use their talents for good.