I am married to a chinese national and live in china with her, we want to apply for a visiting visa to go visit my family and then fly on to mexico for my brothers wedding, then come back to canada for some more visit time before we go back to china. my mom wrote us an invitation letter stating that we would be staying with her and that she would pay for everything. originally it was for us to go in augest and come back in january, but my wife can not get the time off work for that long maybe just 1 month instead of six. should I get my mom to send another invitation letter or do you think the first one is fine. the first one is for multiple entry as we wanted to come back to canada for more visiting time after the wedding in mexico.