A copy and a certified translation of the “Kaiseigen Koseki Tohon”, including details of his/her birth, marriage, and divorce (if any). “Kaiseigen Koseki Tohon” is the original source document(s) of a re-established family register; all names of the family members, even the ones that have been removed due to death, marriage, change of residence, etc., must be included.
http://www.cic.gc.ca/english/information/applications/spouse.asp