I am American living in Japan for 10 years. I will be flying into Hong Kong, then go by train to Guangzhou for 3 days/ 2 nights to stay at my Fiance's Mom's house. Then back to HK by train and stay in HK for another 2 nights.

1) Do I need to apply for the Chinese Visa?
2) If so, Can I just list Mom's address instead of "Hotel Reservation"?
3) I have roundtrip tickets to HK from Tokyo. I will buy the train tickets when I arrive in HK. Can I just show copy of HK tickets for the "Return Ticket" since i do not have train tickets to Guangzhou yet.

THANK You for answering in advance!