On Arbor Day, from the Latin Arbor, meaning tree, trees (as in the green leafy ones) are celebrated all over the world. In the U.S., Arbor Day falls on the last Friday in April, and this year, Colleen of the genealogy blog Leaves & Branches suggested we celebrate our Genealogy Tree on Arbor Day.
The Tree Council of Ireland organises National Tree Week in March each year and Tree Day is celebrated each October, but, we do not have Arbor Day, as such. Nevertheless, I thought I would participate in Colleen’s meme today and share some general information about our genealogy family tree.
Our Family Tree Size
Currently, there are 920 individuals in my genealogy tree – a fairly modest number by most international standards. Serious genealogists, especially those with deep roots in the U.S., often count their ancestors in the tens of thousands, but 920 is probably a fairly average size for a native Irish tree. The renowned genealogist, John Grenham, recently admitted he had a ‘piddling 600’ people in his tree, and he has being researching far longer than I have.[1]
Included in the tree, are my direct line ancestors (maternal and paternal), their siblings, and their siblings’ spouses and children. Researching the whole family like this helps to build a more colourful picture of our ancestors’ lives. Plus, it is often essential to piece together all the snippets of information available for each sibling, before the names of their parents finally become apparent.
Our Family Tree Score
In order to determine the dimensions of my genealogy tree, I counted the total number of direct ancestors in each generation, starting with myself, i.e. two parents, four grandparents, etc. Next, I counted how many of them, in each generation, I had identified. Then, I charted the results, below, adding the percentage number of direct ancestors identified, to give a ‘tree score’. There was a bit of maths involved, but I am an accountant after all.
The tree score for eight generations is 23 per cent, meaning I know the names of less than a quarter of my ancestors, up to and including my fifth great-grandparents. This includes some 'grandmothers', where only their given names are known and their maiden names are still awaiting to be discovered. So, there is still quite a bit of work to do!
When Crista Cowan of the Ancestry blog similarly calculated her ancestral number, in 2012, she based it on ten generations, not eight as I have done.[2] Each generation you go back doubles the number of ancestors, (everyone has two parents), so in ten generations, you have 1022 direct ancestors. But, I know the names of nobody in the two additional generations, so our tree score reduced to just 6 per cent. As only two of the 128 fifth-great-grandparents have been identified and as it’s unlikely the names of many others will ever come to light, eight generations is probably far more reasonable, for a native Irish tree. Why depress myself for not meeting someone else’s potential?
When Crista Cowan of the Ancestry blog similarly calculated her ancestral number, in 2012, she based it on ten generations, not eight as I have done.[2] Each generation you go back doubles the number of ancestors, (everyone has two parents), so in ten generations, you have 1022 direct ancestors. But, I know the names of nobody in the two additional generations, so our tree score reduced to just 6 per cent. As only two of the 128 fifth-great-grandparents have been identified and as it’s unlikely the names of many others will ever come to light, eight generations is probably far more reasonable, for a native Irish tree. Why depress myself for not meeting someone else’s potential?
Our Deepest Roots
Our deepest roots currently belong to the Radcliffe family from north County Dublin. Peter Radcliffe was my fourth great-grandfather from Malahide. He was likely baptised ‘Peter Ratty’ in the parish of Baldoyle, on 25 November 1798, the son of Thomas Ratty and Mary Cullen, and as such, Thomas and Mary are the two fifth great-grandparents in the chart above.
[1] ‘Irish Roots: The Other Clare Roots’, The Irish Times, 13 April 2015.
[2] 'Family History All Done? What’s Your Number?', Ancestry blog, 16 August 2012.
Images: Some old beech trees in the back paddock, Co. Kildare.
[2] 'Family History All Done? What’s Your Number?', Ancestry blog, 16 August 2012.
Images: Some old beech trees in the back paddock, Co. Kildare.
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© 2015 Black Raven Genealogy
© 2015 Black Raven Genealogy