Hang in there. DD would refuse big-looking books, especially if they had small print. They just looked like "mommy books" apparently and she was convinced not for her. We started a book club of just us and I'd read to her. Then little brother would need quiet to go to sleep and inevitably she would want to keep reading, and end up reading the rest on her own, even the next night when she'd just want to read it herself because she could go faster and imagine it better, etc. This was also how I got her to try books with male protagonists and not just magical fantasy genre. She's much happier when she has something to read that she's engaged in ( I mean, family life is noticeably easier!) so I was just trying to expand her reads as we were running out of the same kinds of books from the library. But for a while I did do a lot of searching and requesting and skimming. I used the accelerated reader site to find likely books, and lists online, and there were more easy chapter books in her beloved genre than I'd imagined. Took a year or so to transition to reading any book. TG because there's a lot of junk out there so it's a great place to be, where you can just choose the good stuff! And she still does love graphic novels. Oh, and the promise of watching the film version after reading a book didn't hurt. We don't watch a lot of TV/movies so it's been a treat to watch Matilda, Harry Potter, etc (even Ella Enchanted, which was a godawful movie, but reading that book kicked off a lot more reading of any bigger book). Come to think of it, Dahl is a good gateway level of books. They're mostly short and easy, but very engaging and more involved than the pedestrian easy chapter series. Good luck! With time and exposure I'm sure he won't be able to resist the great books waiting for him
