Canada Tax Questions Answered by Experts
This is not about legal residence but about actual residence.
If you've not yet taken up residence in Canada you don't have to pay taxes in Canada yet.
Once you take up residence in Canada you will start to have to file tax returns as a resident and then income from all sources will be reported. If you start to live outside of Canada then you will have to show that you have severed all ties with Canada but for now you have not yet taken up residence and so don't need to prove these ties were severed.
Your children are a tie and you could live with them of course so when you do take up residency you will likely have to pay taxes even if you don't live in Canada for long but now it is likely you don't have to as you've not yet yourself moved to Canada.
But the law is not completely clear in this area and you really should retain your own accountant in the city where your kids are to discuss your personal details and get an opinion rather than just relying on general legal information which is all I can provide online.