I would have said yes to the DL, but if you can include the Utility bill, such as Hydro (issued within the last 6 months) will be fine as well.
When you raise the CSE via the webform:
https://secure.cic.gc.ca/enquiries-renseignements/canada-case-cas-eng.aspx just include his PR card, passports of you the 3 of you along with the proof of residential address as a bunch...
Once you upload these docs wait for 2 weeks, and then order GCMS notes....