I know you have been doing a great job learning through play at home. The Oak National Academy has some specialist lessons which I thought may be of benefit to Taelor. The videos typically begin with a teacher introducing the lesson to you and is then followed by a lesson to the children. If you think they are of use, you'll probably be able to adapt the learning to best suit Taelor as you see fit.
There are lots of lessons for each of the categories (there are activities for primary and secondary but they are titled as such). I would recommend the Communication and Language section as this will support his acquisition of new vocabulary as well as making links and grouping of existing words.
It will then ask you to select the stage from the three above. I think the "Building understanding" stage is most appropriate but please use your judgement on this.
I hope this will be useful for you and Taelor. I've attached the link below.