Congratulations to Bob Fraser of Sterling, Massachusetts, USA, and Diane Bamberger of Toronto, Ontario, Canada!
Just to give the answer again - we could each theoretically have 4096 ten times great grandparents if none of our ancestors were cousins who married. Here's the table:
2 parents
4 grandparents
8 great grandparents
16 two x great grandparents
32 three x great grandparents
64 four x great grandparents
128 five x great grandparents
256 six x great grandparents
512 seven x great grandparents
1024 eight x great grandparents
2048 nine x great grandparents
4096 ten x great grandparents
And theoretically, if you keep going back, by the time you get to your twenty times great grandparents you would have 4,194,304 ancestors within that generation - but that's a bit unlikely! We'd be well into the realms of cousins intermarrying by this point - not least of which because we'd probably have more ancestors than the population of Britain!
If you would like to get a copy of Irish Family History Resources Online it can be purchased from Gould Genealogy at www.gould.com.au/Irish-Family-History-Resources-Online-p/utp0282.htm - the international postage rate from the company is the same rate as postage would be within Australia.
Chris
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