I would like to keep my children together but not sure if that's possible. They are all close in age but academically is another story

I have dd12, ds11, ds10, ds9 and ds7. This will be for next school year 12/13, so they will all be a year older

I would like to use CtC but am not sure my youngest who will be 8yrs. old can handle the writing. All my boys are also late readers who are not strong readers. DD is a very good reader. Same with spelling. My boys are currently working their way through AAS and using Simply Spelling which is prepared dictation. They copy and study the passage 3x week and I dictate it Fri.
Because my youngest son is currently learning to read still (cvs words finally

Okay now for questions. Would it be better to split the children up? Have my 12, 11 and 10 your old do CtC and the two younger boys use Preparing (I'm mostly wondering because of the writing, spelling and dictation passages)?
If I don't split them up are there dictation passages that my two younger one can handle (I could always use something else for LA as well). Most likely the older children will use Shurley English or Analytical Grammar (we already own them).
I would really like for my three older kids to do a lot independently but again even my two middle boys are not where they should be with reading. I may have to read most everything, anyone else using CtC this way?
Sorry for so many questions. I wouldn't mind using two guides but am not sure if I can really handle it. I'm still teaching phonics, grammar, writing,spelling and so forth with many of my kids. Plus my oldest will start high school as well.
I guess my main concern is the two younger ones. Any help or advice will be much appreciated.
Blessings,
Linda<><