What information do parents need to travel to Canada? I am an immigrant. What should my mother and I prepare now?

Go to the website of the Canadian Consulate in China, download it directly, and fill in the form as required, as simple as possible. Give whatever you want, and don't provide anything else, so as not to gild the lily. I do this every time my parents come over. Soon, the most important thing is to write your invitation letter. Send it back through Canada Post Office and provide an envelope. Visa officers are human, too. I wish you early success.