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# Same birthday, different year, SAME FAMILY Probability

Kpage

1
Sat 11 Jul, 2015 05:42 pm
My sister in law had al her 4 children the the 27th of a month. Different month and year but same date. Each are few years apart. What is the record or probability fir that? Any insight
0 Replies

archangel9999

1
Mon 27 Jul, 2015 10:25 am
@Abear,
Probability of someone else sharing your particular birthday (month/day) is 366 - of two others sharing it it's 366*366 - and so on - then divide by the population size of your family - note that this is not the same math as the birthday paradox which just seeks to compute the probability that at least two people in a given population share any birthday - you're seeking the probability of matching a particular day - if you just want to know the odds of any two people in your family sharing any birthday, then use the birthday paradox formula - the odds of it are 90% at only 40 people and ramp up asymptotically as population size increases (99% at 60 people)
0 Replies

HesDeltanCaptain

0
Thu 13 Aug, 2015 06:13 am
@Abear,
Was time in the womb identical too? Just because 4 people have the same birthday, doesn't mean they all spent the same number of days in the womb like.

Behaviour of people doesn't usually change, so that people conceived around the same time each year isn't all that unusual. And with induced births now, they coulda deliberately caused labor on the same day for some odd sense of parity or the like.

Problem with probability is given enough chances, even the most absurdly unlikely events will happen. As they say, any event without a zero percent chance of occuring has a 100% chance of occuring given unlimited time.
0 Replies

duggy

1
Mon 16 Nov, 2015 08:46 pm
@Abear,
I am born on the same day as my sister who died a after 3 months 1958, I so wish I she had lived! I was born in 1959.
0 Replies

Abbe

1
Tue 12 Jan, 2016 08:12 am
@Abear,
I have a my dads cousins wife, my cousins son born on the same day and also my husbands cousins daughter delivers twins on the same day there cousin was born and the same year. That's three second cousins on the same day and year and one more second cousin with the same day. Also my husband and his cousin( the one who's daughter had the twins) also have the same birthday together. Just not the same as the other five.
0 Replies

Jpaullis

1
Fri 22 Jan, 2016 03:23 pm
I share the same birthday with my older brother was a year older than me and my younger sister who is 12 years younger than me December 8 brother was born in 1966 I was born in 1965 my sister was born in 1977
0 Replies

Bhusan

1
Tue 16 Feb, 2016 07:43 am
Hi,

My sister and me are twin and My son was born on the same date and day after many years(30)
0 Replies

toddhicks209

0
Thu 25 Feb, 2016 03:59 am
@LUSK04,
I don't know if there is a name for family members or relatives born on the same day but in different years but I will point out that my grandma and I were born on June 4.
0 Replies

pcswonder

1
Thu 6 Oct, 2016 04:36 pm
I have a circumstance whereby my boyfriend's Father and my Father were born on the same day (May 8, 1930) and his Mother and my Mother were born on the same day, 2 years apart (August 28, 1930 & 1932). I was just wondering how rare this might be, but cannot find anything on the internet.
0 Replies

Lillabelle

1
Fri 6 Jan, 2017 08:56 am
@fbaezer,
That may have the same biological father? My son has 2 girls, 4 years apart, different mothers. Born January 6th 2003 and January 6th 2007. They was both conceived on April 4th 2002 & April 4th 2006. My sons Own birthday. His 21 and 25th birthday.
0 Replies

Lillabelle

1
Fri 6 Jan, 2017 08:58 am
@mrflashpot,
Is your birthday on June 8th?
0 Replies

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