Despite the name, this is a mockumentary comedy, not a "how to research your family tree" program. The comedy series follows Tom Chadwick (Chris O’Dowd in charming loser mode) as he tries to learn more about his ancestors. His family tree is described as "a world full of weirdos." Tom learns that a great aunt has left him a trunk full of strange objects, and with nothing else to occupy his time, he sets out to learn more about the family members they belonged to. It seems that none of his family members qualify for the title of "normal."
I still hope to watch Family Tree but I expect to watch a great comedy program, not a program showing how one person researched his ancestry.
You can learn more in an article by June Thomas at http://goo.gl/wAw7d.