Good for you to read to your kids!! Now let them read to you or independently on their own. We limited our three children to what they could carry out of the library themselves...so the youngest girl found the biggest grocery brown paper bag, and filled it to the brim...and struggled out of the library to the car carrying the full bag...we had to return to the library in about 3 days, 'cause she had read them all!!
All our children were readers, (we were both readers, too) and they built up their vocabulary that way, took the math and science courses to gain that knowledge, and became National Merit Scholars...earning their college degrees themselves. Cousins in dh family did it also...well, a couple of them did.