Welcome to the forum, we're so glad you found us! And just to start off, it is NEVER to late to help your child with reading and you are doing the right thing to intervene!
I don't know about teaching specifically in regards to a reading disorder, but if you can get him to watch LR with his younger sibling that would be helpful. At age nine, he may benefit from additional materials, too. Have you considered Hooked on Phonics? This is an older blog post and some things have changed since writing it-- Little Reader now incorporates more phonics instruction and can break up words by chunks or letters, and my kids now have the stamina to read through the Master Reader stories unlike when they first started out. Anyways, this blog post will tell you more
http://teachingmytoddlers.blogspot.com/2012/12/hooked-on-phonics-hooked-on-spelling.htmlI just think with a 9 year old, workbooks might be helpful too, unlike with a small baby. There is also:
http://readingeggs.com/ and
www.readingbear.org . There are many programs out there that can be used with an older child, but it would be helpful to know more about how he is doing. Does he know his letter sounds down pat, is he reading 3 letter basic words like pat/rat/cat, and so on? Does he struggle with breaking up big words to sound them out? It the problem decoding, stamina, or comprehension? Have you had his ears and eyes checked? (yes, really!) Does he have a diagnosed learning disability, in which case, non-reading related developmental activities might be helpful such as brachiation ladders, cross pattern crawling, brain gym, and swimming. We could help you better if you explained a little bit more.
We are not a group of professionals, just loving parents who want to teach our kids like you. So take our suggestions with a grain of salt, but hopefully you'll get some helpful ideas here.