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Old 09-25-2012, 07:11 AM
Hari Seldon Hari Seldon is offline
Join Date: Mar 2002
Location: Trantor
Posts: 11,545
As I explained in my previous post, MRCA is irrelevant. FWIW, the MRCA appears to go back about 250,000 years, maybe 10,000 generations.

Incidentally, I was wrong in my previous post (#28) in stating that Alice, Bob, and Charles, although first cousins to each other, shared no ancestor later than the third generation preceding. Actually, their MRCA could be indefinitely far back in the scenario I envisaged.

Incidentally, the question of whether second cousins thrice removed could be of marriageable ages is not clear. I was thinking about my mother's first cousin cohort that ranged over 44 years, from her older brother born in 1904 to her first cousin born in 1948, the same year as my sister. Now if you go to second cousins, the age distribution could get very large and, anyway, a 60 or 70 year old man can still father a child.