Lol, it's about the same with my mum, at least she likes Kuu really much as well, loves to watch concerts from her with me. And other people here already mentioned that their mums or brother and sisters like her as well. I remember one mum being a big fan of her!
I don't know but I do have the feeling from all the japanese female singers Kuu would have the best chance to get popular here in the west.