We struggled to read their schoolbooks with them as, let's face it, the content of reading scheme books is appallingly dull and threatened to turn them off reading. I don't think we managed to read the reading scheme book 3 times a week for more than half a school year in total with each child (though maybe we did and I've blocked it from my mind - it was a painful chore).
But, we did read with the kids, (other, more interesting and engaging books) regularly and enthusiastically, and told the school what we were doing, which they were fine with. We did a lot of reading to them, getting them to point out a word I'd read in the last sentence, getting them to sound out a few words, or read a line, or a paragraph, a page, a chapter (as they progressed). We also shared audiobooks and watched documentaries together - being able to pause and discuss what they've seen and/or heard encouraged verbal comprehension, which I guess may have helped with their reading comprehension. Regardless, they both got turned on to enjoying stories and knowledge.
Both kids only really developed a love for independent reading once they were able to enjoy longer, more interesting books (things like Kay's Anatomy, Monster Doctor). The more reluctant one got reading for pleasure during Yr3, going through things like Captain Underpants books, The Monster Doctor series, Dog Man, Investigators, Asterix, Level Up books, The Danger Gang, and The Last Dragon Chronicles (the last took a while). They both read in their rooms before going to sleep, and whenever they feel like it throughout the day.
Other things which I think help their enjoyment of reading are that they have library cards and online accounts with the library, so can research things they'd like to read next, place reservations, then go to the library together after school (independently) and exchange their books, so reading is tied in with their developing independence. The also see the adults in their life reading for pleasure.