I believe i'm a descendant of Ferdinand and Isabella Carroll as well. I dont know any of them personally but my sister found a letter from some relatives (blairs?)after my grandmother died that showed some ancestry history. It was a long time ago, so i havent looked at it in a while, but my husband got me the DNA test thing for my birthday last month so I started looking into this a little more.
My mother is Lucinda "Cindy" Carroll Phillips. She is still living (turning 66 this weekend) but pretty severely mentaly ill and so not a very reliable source. Her mother/my maternal grandmother was Ruth Bonita "Bonnie" Phillips (maiden name Palmer) born 10/15/1910. I want to say that I was in 4th grade when she passed away in Hawaii...so maybe it was in/around 1991.
According to a the letter from distant relatives: Ruth's parents were Bonner and Gertrude Palmer (maiden name Carroll born 5/16/69- died 7/21/1961). Gertrude's parents were George Willard Carroll (4/8/1853-4/20/1919) and Mary Lucinda Blair. George Willard Carroll's parents were James M. Carroll (12/28/1813 to 8/29/1896)and Caroline K Jones. James Carroll's parents were George Carroll (7/31/1781-1875) and Mary Morrison. George's parents were Ferdinand and Isabella Carroll. The dates I have for george carroll are not the same as what you have listed. I dont know where the dates I have came from-they were in a letter to my grandmother from someone in Blair family back in the 80s but i'm not sure where they got their dates.
Anyway, hope that helps in some way.
~Sarah, 35, Decatur, Ga