How many Irish cousins: the impact of endogamy- Part 4 in Series

In previous posts I described the calculations used by several sources to predict the number of cousins we have at different degrees of cousinship (first, second etc). The calculations assume that our ancestors are not related to each other i.e. no first-cousin marriages or other types of inbreeding. If we have a significant number of … Read more How many Irish cousins: the impact of endogamy- Part 4 in Series

How many Irish cousins: according to AncestryDNA – Part 3 in Series

My previous blog post was on research by scientists at 23andMe on predicting our number of cousins. I applaud 23andMe for the publication of the research in detail. AncestryDNA have also researched the topic but as far as I can find, they release the information through the marketing department with big headline numbers and not … Read more How many Irish cousins: according to AncestryDNA – Part 3 in Series

How many Irish cousins: according to 23andMe – Part 2 in Series

Yesterday I wrote a blog post based on an entertaining article from Tim Urban to calculate our number of cousins at various distances using birth rate statistics. Today’s post is based on an academic study by researchers from 23andMe (Henn et al) which covers a wealth of complex analysis that includes a table of “expected … Read more How many Irish cousins: according to 23andMe – Part 2 in Series

How many Irish cousins: according to Tim Urban – Part 1 in Series

Tim Urban wrote an entertaining blog post in 2014 on calculating a ballpark number of cousins based on your country’s average birth statistics. His formula breaks down the totals by degree of cousin i.e. 1st/2nd/3rd/4th and outward. Tim calculates numbers for USA, UK, Canada and a few other countries, but not Ireland – so I … Read more How many Irish cousins: according to Tim Urban – Part 1 in Series

Your 5th cousin isn’t a DNA match? Don’t jump to conclusions!

In Ireland, the “townland” is a small area of land supporting a number of households. The townland of Creeny (or Creeney) is in County Cavan. In 1901 there were six households in Creeny. This reduced to five in 1911. Two of the households have the surname of Gamble. Thomas and Mary Gamble sold their farm … Read more Your 5th cousin isn’t a DNA match? Don’t jump to conclusions!