I’d recommend Reading Reflex – that book has a lot of games for developing the listening skills necessary for reading. I never did any of them the way the book says (copying the pages and cutting out the slips of paper and keeping them in envelopes, etc.).
I just did them out loud while we were in the car or while I was washing her hair or anytime we were waiting for something.
I’d say /b/ – /a/ – /t/ – what word is that ? And she’s say bbbbbaaaaaat – that’s bat. (of course, it took a while for my daughter to get it!)
And then you reverse it. What sounds do you hear in mmmmmmmaaaaaaaat? and she’d say /m/ – /a/ – /t/.
Things like that. If you just do it while you’re waiting or while you’re cooking together or whatever, it’s a background activity – it’s nothing to stress over. Your son won’t really be aware that it’s a reading lesson.
Be aware, that we were doing these games for more than a year, off and on. So, it’s a process. Don’t rush your son. And don’ feel in a hurry yourself. The goal is to get your son reading…..on his schedule.