I've seen this a few times.
The first time was sent as an email from my grandmother to her daughter, my mother. My mother asked the rest of us in the family.
I got it right. So did my grandmother.
People have been saying for years that we are very similar.
(No one else in my family had the 'correct answer')
I think this answer is easy to come up with if you follow a logical thought process.
Meet man at mother's funeral -> Fall in love -> Fail to see him again -> How to find this person? -> Create similar situation -> People avoid family reunions, and often don't bring friends of family (plus, no one seemed to know him) so... -> Create another funeral situation -> Closest person to mother is sister -> kill sister (never liked her anyway ) -> see man at her funeral -> Yay, don't get caught