:grouphug::grouphug::grouphug:
In a few years, you will look back on this time and laugh even though right now, it's so difficult.
I would definitely have your ds12 watch educational videos, do audio books (or read if he can hold a book), and do work orally together if you are worried about school.
For the siblings, this is where they learn that sometimes life hands us things we don't expect and it means we all need to step-up and adjust. So, keep doing school with them, let them know their brother will be catching up later, that accidents happen, and there are consequences. The lack of attention to one child over another is called for in this case, and I think it's good for siblings to learn that... as long as it's happening due to a circumstance such as this and not because of parental favoritism :001_smile:.