Birthday coincidence

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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 mother had four children: my eldest sister born on 13 April 1949; my second sister born on 13 April 1951; my brother born on 13 April 1953; and I was born two years later but two days "late" on 15 April 1955. My sister gave birth to my mother's only grandchild on 14 April 1983. There are many other continguous dates coincidenes in my family including my father and mother's death dates, 25 hours (and 51 years) apart on 27 March and 25 March respectively. I'd love to know the statistical chances of all of this. LTG (I have already posted this but it doesn't seem to have gone up on the site.)
Total votes: 172
Date submitted:Sun, 15 Jan 2012 23:11:45 +0000Coincidence ID:4956