Enigma 1637: In-laws
12 December 2011
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From New Scientist #2803, 12th March 2011 [link]
Four pairs of siblings were great friends right through school and eventually the eight (all mentioned below) paired off in man-woman partnerships and got married. They had no other siblings.
Alan has two brothers-in-law, Brian Long and Eleanor Short’s husband. Fiona has no sisters-in-law. Mrs Tall’s brother Colin states that his sister-in-law’s sister’s sister-in-law is Geraldine. Hannah’s sister-in-law’s brother’s sister-in-law is married to David.
Name the four married couples (eg: you might have Alan and Eleanor Long, and so on).