Interviewer instructions
People who live together as husband and wife and who so regard themselves as husband and wife, should be recorded as married. If a person has been widowed but has since re-married or is living in a consensual union, s/he should be recorded according to the current marital status. The same applies for a person who was once divorced but has since entered into another union.
Thus, it is the respondent who defines his/her marital status.