They start pretty much as the book begins, and end at the other side of the book.
Corsi baselessly suggests that Obama's father, Barack Obama Sr., may have divorced his mother, Stanley Ann Dunham, "following the prescripts of Islamic sharia law." Corsi's sole source for this statement is a blogger who made the claim in a March 20 post, which featured the false headline, "BARACK HUSSEIN OBAMA WAS MUSLIM FOR 31 YEARS" and misstated Obama's mother's name as "Shirley Ann." The blogger Corsi cited, "Majalah Bulanan Kumunitas Indonesia Di Edmonton," provided no substantiation for the claim that "the senior Obama divorced Dunham according to Sharia law."
On Pages 49-50, Corsi falsely claims that Obama did not dedicate Dreams from My Father to his mother or his grandparents.
However:
"It is to my family, though --
my mother, my grandparents, my siblings, stretched across oceans and continents -- that I owe the deepest gratitude and to whom I dedicated this book. Without their constant love and support, without their willingness to let me sing their song and their toleration of the occasional wrong note, I could never have hoped to finish. If nothing else, I hope that the love and respect I feel for them shines through on every page"
Corsi falsely claims that Obama does not mention the birth of his half-sister, Maya Soetoro-Ng, during the chapter in Dreams in which he discusses his time living in Indonesia.
However:
In fact, on Page 47 of Dreams, in the chapter discussing his time in Indonesia, Obama writes that "my mother and Lolo would remain cordial through the birth of my sister, Maya."
http://mediamatters.org/items/200808040005