I'm going on vacations for a month and my boss gave me permission to do so...what can i do to make it longer?

I live in Canada but I was born in Colombia. I've been working for this restaurant for almost 4 months now. When I'm going away for vacations I will have completed about 6 months. I recently asked my boss for a one month vacation and he said it was ok because of the reason I'm going to get married. The thing is I'm really in love and I would like to extend it longer to like the end of December... What I can think of is to come up with a lame *** excuse like I got stuck in my country for migratory reasons and I can not comeback in a couple months. I'm also trying to get my brother to cover up for me taking my place while I'm gone but I'm not sure if that'd be enough. I also know that since I live with my parents they would be furious if I do that and also recognize the privilege that is actually having a job nowadays. What should I do?