Lincoln, Davis and Booth: Family Secrets

[Gene C]

On the Amazon web site for this book, there is a short biography on Mr. Cowan, and a sample of the contents of the book (the table of contents, introduction and a few pages of chapter 1)
http://www.amazon.com/Lincoln-Davis-Boot...1483601730

There are 2 points I have not heard before and was hoping someone could confirm.
On page 12 of the intro "Nancy married Thomas Lincoln. Neither could read or write,". I was of the understanding that Nancy read from the Bible to Abraham and his sister when they were little.
The second item is about Thomas Lincoln and his inability to father children. I think if I had read this before I would have remembered it. (ouch) A reference is made to "the Hidden Lincoln". Can anyone verify the reference, and has any one heard of this claim about Thomas before. Since Nancy had three children, it cast dispersions on her character, if true.

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To answer my own question #2 above about Thomas Lincoln, the book "The Hidden Lincoln" is on line. I could not find the reference referring to Thomas Lincoln
http://archive.org/details/hiddenlincolnfro00hern