Same here.
Actually my brother started off as the Jpop fan, so myself, my older sister and my mum were already familiarized. Then he stopped and I followed on. I converted my younger sister (and my 8 year old sister recognises some songs too!) and my mum ^_^. My mum likes to tease me about it actually
So basically everyone in my family except for my dad knows about Ayumi and her songs. Utada too.
Also one of my best friend is a best friend because of Jpop too
He also likes Ayu along with BoA and Ostuka. I have converted 2 or more friends...