Gillun (sic), John, aged 60, tayler (sic), born Ireland Gillun, Emaline, aged 37, born Georgia Gillun, Robert, aged 22, born Georgia Gillun, Frank, aged 16, born Kentucky
Two other sons are living next door with their wives and children.The family is in the same county in the 1860 census -- John's wife, Adeline, is aged 35, and the oldest child, Sarah, is 20, born in Georgia. However, in this census, it indicates that John was born in Scotland.The 1850 census in Greene County, Georgia also indicates a birthplace in Scotland.
In the 1880 census, John, still a tailor, is living in Rock Castle, Kentucky; indicates he was born in Ireland, living with his eldest daughter, Sarah Lamb.
You should try to find out more info about his death, likely in Kentucky, which may provide you with additional info.