(Provide photocopies of all your official school records if applicable for the relevant four (4) year period immediately preceding the date of your application, provide.
In addition, provide photocopies of official school records for any dependent children in Canada or abroad even if you are not applying for Canadian citizenship on their behalf.)
the guide for citizenship application at cic website and it is clearly stated the even if your dependent children not applying for the citizenship with you
you have to attached the school record .
if your son is not dependent that mean he is 18+ you do not need the school record