In that case your situation is unfortunately quite complex.
You and your non-Canadian citizen child need to apply for a TRV (tourist visa) in order to be able to travel to Canada. If the TRV is approved, this will allow you to visit as tourists but not move to Canada permanently. However if you can get the TRVs approved and then travel to Canada with your entire family, you can try applying for PR under the H&C (humanitarian and compassionate) program based on having three Canadian citizen children. Note that an H&C application is only possible from inside of Canada. You cannot apply from outside of Canada.
In order to get the TRVs approved, you will want to show strong ties to your home country such as employment and property ownership. You will also need to show that you have enough funds / savings to cover the costs of your family traveling to Canada and also accommodations. The fact you were previously approved for refugee status will likely make it more difficult to get a TRV approved. Make sure you declare this information in the TRV application. Be prepared for the possibility that the TRV may be refused. I do think there is unfortunately a high chance of this if IRCC is concerned you plan to use the TRV to try to move to Canada permanently.
Good luck.