Like my grandad did for the Fitzgearlds, family historians on the Yearout side have also created a book on our lineage, which I possess.
I'd have to re-read it to be sure, but if memory serves, that book may have significant errors. According to a note toward the end, the authors found some new piece of information (not specified within the note) that could prove much of the book wrong. But the authors were not able to dedicate many more months of research into the project, so went ahead and printed the book as-is. Thus the book presents a challenge to future family historians (I guess that's me) to pick up where the authors left off and verify the information. Or, God forbid, start from scratch.