My family is a bit of a mixed bag. I am the biggest reader, although my mother and sister read a fair bit too. My brothers are either uninterested in intellect or paranoid-religious-ocd. My father read the odd book, both my parents mainly stick to thrillers nowadays.
As a kid, I was encouraged to read -- but only the right books. My mother is still worried about my reading Sci-Fi/Fantasy, she thinks it's an excuse for escapism and would much rather me read thrillers. (She was the main arbiter of reading in our house.)
Also because my books might be dirty -- ironically the thrillers are more dirty than most of the books I read.