you do not qualify for the supplement "legally" living out of country.might i suggest that including your son in a fraud is not a nice thing to do.
you do not have to even have an fmt to buy property in mexico.
contact the mexican consulate in vancouver to find out how you can qualify for an fm3 which is all you will need to live in mexico. contact cpp "before" your 60th birthday if you want to start collecting this earliest. do it by phone-they are very helpfull.
i am canadian and do everything legally.