My DS1 has just been diagnosed as Intellectually Impaired, and won't be able to start QLD Prep (aka Kindy in other States) next year with his brother as he'll be attending a Special Education Centre instead. DS1 isn't really aware of the implications of this, and is fairly nonplussed. But DS2 is very distressed. They currently attend CC together and DS2 has always assumed they'd be off to school together in the New Year.
Shortly I'll start sending DS1 alone to an early intervention centre twice a week, so that may help ease into the initial (separate) school transition slightly.
I also start to wonder about silly things in the future, like birthday parties and the confusion of their friends over the fact DS1/2 are the same age yet at least one Grade apart, etc.
Does anyone have twins in separate Grades at school? I know of sets of twins where one sibling has special needs, but I haven't come across any that have ended up going through schooling at different levels. I'd love to hear from any!