My mum, and Dad hate most of my music. They don't complain, but they prefer that I keep my door shut. My Dad has come in mocking the vocals before.
I tried.. once to put a Within Temptation CD with my grandparents and mum, and they thought it was terrible - wtf? It is hardly death metal.
My brother likes much of my music/COB, but he is more into soilwork.