Truly, again, thank you for everyone's help. This is a lot of information, but I'll chunk it step by step and go through the programs.
Good luck.
As for general comments about what might be best for you and processing time, there will of course be different opinions. It will depend on employment and other aspects we don't know about. My own two cents:
-You can certainly expect IRCC to come back with requests for more information/evidence of your 'intent to return.' Given your shorter history in Canada, that is. You can't fully fix that now - prioritize getting your app in (and provide what you can now).
-After you submit, continue to prepare and collect
any and all evidence of your preps. Moving arrnagements, schooling, vaccinations, whatever - even correspondence.
-We submitted correspondence from family and friends about the long-term discussions we'd been having about returning. Just short factual letters.
As for place you choose to live:
-What you indicate on the form does not have to be where you end up - BUT Quebec special in this regard. Perhaps it will make more indicate to target being closer to your family. If you have to change it during the process, no formal notification required (except Quebec - don't do it) - but if you do so with good reason (eg employment) then documentation all the better.
-Would highly recommend you at least visit Canada during the process. It's also evidence of your seriousness.
-Location might ultimately be driven by employment and - as hinted by others - monetary concerns. Employment will likely drive the monetary - for most anyway.
-As for the cultural/language elements - most big cities have substantial Chinese communities, and many mid-sized ones do, too. Including multiple languages (Cantonese of course but more, Hakka, etc), multiple countries of origin (HK but also just about any other country where there are 'overseas Chinese').
That's not attempting to draw a conclusion for you but that realistic options may be wider than you expect that would be manageable for your family. With internet and satellite tv and options like that, communications issues less critical. YMMV of course. (Or maybe they won't be bothered or interested at all after a year or two - happens to many).
Each of the many topics like schooling and health insurance and pets etc have lots of details.