I asked McGervey about the odds of that happening. He calculates the probability of one set of twins of the same sex at one in 100 and the chance of two such sets in the same family as one in 10 million. Now these are long odds. Yet we may be assured somewhere it has happened. The moral of the story is assumptions are risky.
Genealogists are well-advised to play the odds in research but never in reaching conclusions.
Conclusions require evidence. Copyright 1996 Tri-City Herald. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.