In the 1850 Illinois census, Stephenson Co., Florence, Roll 129, Page 345 I found an entry for Thomas Gatliffe.It is difficult to read but my guess is: Thomas30 yrs farmer looks like born in Ky Nancy23 yrsKy Cornelius 4born Ill. Emily 2born Ill James(?) 6 mo. born Ill.
I was looking for Nancy Gatliffe and her daughter Annie (1843-1886) in the same Co. Her father is R.B Gatliffe according to an obituary notice from WI where Annie died. Hope this is your Thomas.
Please let me know if we have a connection. I have just started the Gatliffe line. Betty