I do understand that I need a visitor visa and as for my work, it's limited to online review of technical proposals which I can do in my residence, so no Canadian clients and no involvement with the Canadian market. My son is applying for a study visa, i'm just waiting for address details to complete the application form.Not clear which country you are from but unless you are from a visa exempt country you will need to apply for a visitor visa (TRV) and to work remotely on such a visa or as a visa exempt it is important that the company has no Canadian clients that you would ever interact with whilst on a visit. Your son will need to apply for a study permit, not clear whether you already have this being processed other than your comment about a custodian.
There is no guarantee of course that when you arrive in Canada that you would be issued with an initial authorised stay greater than 6 months so keep that in mind that you may need to apply to extend your stay once in Canada.
I'm hoping to be granted a visit visa that covers the duration of the school year (Sep-June). if not then I will have to come back and apply again for another visit visa to support my son in his final exams.