Is Cantonese spoken in Japan?
Rationale first then the answer.
Cantonese is a dialect of Chinese language used in southern China. There is no relation to the Japanese language.. The answer is: no.

Do many fans of J.K Rowling know who Alan Rickman is?
Rationale first then the answer.
J.K Rowling wrote the Harry Potter series. Alan Rickman performed the role of Severus Snape throughout all 8 Harry Potter films.. The answer is: yes.

Did Eddie Murphy's father see his first stand up show?
Rationale first then the answer.
Eddie Murphy's father died when Eddie Murphy was 8 years old. Eddie Murphy's stand up career began when he was 15 years old.. The answer is: no.