Wise decision to keep him tagged along until you land.
If you go separate ways prior to landing, you might have to go through all the procedure again. Divorce etc. And even then the PR documentation will require you to get his signature and child stuff etc etc... Terrible.
After you land, everyone is on their own, you cannot do anything about that.
Ditch his ass once you are in Canada, and let him try to work and live. Best of luck.
