Same birthday, 4 of us, but all different years

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understandinguncertainty.org was produced by the Winton programme for the public understanding of risk based in the Statistical Laboratory in the University of Cambridge. The aim was to help improve the way that uncertainty and risk are discussed in society, and show how probability and statistics can be both useful and entertaining.

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My DOB is 16-04-1953. My brother's DOB is 16-04-1955. In 1960 we moved into a newly built house in Horley, Surrey. A couple of months later a family moved into the house next door, with 2 children, a girl and a boy. We had never heard of or met them before. But it turned out the girl's DOB is 16-04-1954 and her brother's birthday is 16-04-1956. How rare is that?
Total votes: 364
Date submitted:Wed, 27 May 2015 23:48:23 +0000Coincidence ID:8097