text: this is an odd riddle? what are you to your fiancé’s  wife’s husband  for a girl or your fiancé’s  husband's wife for a guy? i think you've got a word wrong in their somewhere, or else it's just creepy.  the part about a females husband's wife does bring you back to the original female, but it's the fiance part that throws it off.  you can't have a fiance that has a husband or wife because a person can't be a fiance and a spouse at the same time, unless you are engaged to be married to someone who is already married and you are both going to be married or your fiance is going to be getting a divorce from their spouse.  seriously, the answer is you, but it's kind of screwed up unless you messed something up because it involves the starting person having a fiance who has a spouse already.