Invitation from my chinese friend's family

hello, i am currently studying in canada and i have been here for one year and a half. My boyfriend will go back to China this summer and he would like me to come with him. His parents are willing to write me an invitation letter and provide me accomodation as well as food during the time i stay there. I did book my ticket and applied to renew my canada entry permit.
My question is that what type should i apply since i am confused because there are so many types , for example, private visit, family reunion, Etc, and should the invitation letter be in chinese or english, handwriting or typing form?
Thank you.