Birthday coincidences

[snowyw]

I was born on my grandad's birthday.
My cousin was born on my sister's birthday.
My other grandad (born Xmas day) died on his wife's birthday and she also died on her birthday - which had been Coronation day.

Princess Diana died on #1 son's 18th birthday.
Zara Phillips was born on the same day as #2 son.
King George VI died on my mother's birthday.

I'm sure there were others too.

Phew!!

[cjl]

 My eldest daughter was born on my Mums birthday.

My youngest daughter was born on my great grandmothers birthday.

My dad died on my wedding anniversary.

CJL

[Nutty1966]

My uncle and I share a birthday, he is also my godfather 13th March, his ex wife (my godmother) and my ex husband share a birthday 9th July, we both got divorced in the same year 

My eldest son was born 21st Jan as was my ggg grandfather, I could have named Sam after him if I had known, Golden Harvey sounds good eh!!


Sadly August is a bad month for my mother's family, both her parent,s and three out of four grandparents died in August and December is the worst ever, I lost my dad at Christmas time, and his mother, brother and one great aunt all died in the same week several years apart.


Jane

[Suzy W]

My son was born 90 years to the day his gg grandfather was killed at the "Battle of the Somme".   

Suzy W

[Ceeoh]

I have numerous coincidental birthday/marriage/death dates - which I would have to look up.  But interesting this year is a granddaughter turning 12 today on the 12th, another one turning 21 on the 21st September.  12 and 21 can be reversed.  One was born 98 and the other 89 - also reversible

Ceeoh

[aelf]

I can't do the maths, but I seem to remember that statistically you are more likely than not to find two people sharing a birthday in any group of 26 or more.

My daughter, mother-in-law and wife's cousin share a birthday.

So do my wife and my aunt (and Hitler)

[johnxyz]

You need 23 people to have a better than 50% chance of coincident birthdays.

If you really want the maths:

It's easiest to calculate by looking at probability of no matches.

First person's birthday is arbitrary

For second person not to match, must be born on any of the other 364 days, so probability 364/365 (ignoring leap years!)

For third person not to match either first or second, must be born on any of remaining 363 days. Probability of this 363/365, so probability of no match so far is now (364/365) * (363/365)

Keep adding people and multiplying - result goes below 0.5 at 23 people. That is probability of no match is less than 50%, so probability of at least one match is now more than 50%

[peckj02]

My mum and one of my uncles both born 17th feb, another uncle and myself share 27th june and my dad and one of my cousins share the 2nd august.

My eldest son birthday is 30th july, dad's as I mentioned above is 2nd august and hubby's is 7th august. Very expensive week for me !

[Scales]

No birthdays in my tree ... that I am aware of anyway ....  but my g g mother was born 1900 her son born 1920 and he married someone born 1920 their daughter (my mum ) born 1950 she married my dad born 1940 I was born 1970 ....... this year would be birthdays  g grand mother 110  nan  and grandad both 90 . dad is 70 mum would have been 60 and i will be 40 ..... sadly only me and Dad left !!!   

p.s Thats Nan and Grandad on my profile photo