He's not one of mine, unfortunately. It seems your James died in 1851 according to the familysearch website and if that's correct he can't be. Mine was dead before 1841 census as far as I can make out. However, your James, b. 1789 is the son of a John Nettle and Jennifer Williams of St Agnes, Cornwall. A friend in the US has forwarded me information on this family tree, which she obtained from someone in Australia. It goes back to about 1650, starting with a Robart Nettle in Truro. Did she get it from you? If not, do you want me to send it to you? If so, let me have your e mail address.