Please Advise Visitor Visa extension

[sarah24]

Hi, please advice me. I came to Canada in May 2014, my mother sponsored me, I am 23 year old. My boyfriend came like a visitor in June and he remain with me, we are living together. We would like to extend his stay in Canada for another 6 month. Can somebody give me a hint what kind of reasons we can use to extend his stay and what kind of papers we can submit to obtain an extension. I am working full time. Thank you.