I just saw this excellent documentary produced by Channel 4 : "Nazi Pop Twins is a one-off, one hour documentary where filmmaker James Quinn investigates the controversial American pop band Prussian Blue, whose teenage twin girl stars have made headlines across the world with their white nationalist music and as poster girls of neo-Nazism. (...) Filmed over a year, Nazi Pop Twins follows James as he is invited into the home of the Gaede family where he aims to discover the secrets of the twin's notoriety and the motivation behind their controversial music.

As the family allow James and the cameras into their lives, he discovers some disturbing truths beneath the happy family image that determined mother/manager April likes to project. Is she, in fact, just using Lamb and Lynx as a mouthpiece for her own extremist views?"

"Nazi Pop Twins" can be found on YouTube (5 parts)

Wikipedia: Prussian Blue