DSS (aged 12) reads to himself now but will discuss his books with us lots. His mum read to him until he was about 10, though he could read himself. He couldnt read at all till he was about 8. But we all think that us and his Mum's reading to him meant that he overcame his reading difficulties (a mixture of dyslexia and a bad speech impedement) and made him determined to do read.
He now loves reading on his own.
Our DS1 (aged 3) would have us read every book in the house if we could get away with it. But we usually read him about 4 before bed, but a few during the day as well.
DS2 (aged 18 months) loves books and gets a couple before bed but more in the day, as he loves going to bed so much.