They definitely don't read to their kids, I highly doubt they do school reading with the little ones either, going by what they were like doing the homeschooling - Halle and Phoebe could barely sound a word out, nevermind read a book!
My eldest is slap bang between Halle and Phoebe in age, we probably have about 4 or 5 HUNDRED books between her and her little sister, it's getting a bit ridiculous! We also subscribe to Reading Chest which send out the levelled school readers, you send them back and they send you more, so we have a never ending supply of reading material for our eldest, who is always reading!