My great-aunt, Margaret Jane McWhirter b.1850 in Mercer Co., PA, was the daughter of John MCWHIRTER b.15 Nov 1809 in Derry Co., Ireland, and Margaret CLARK b. C1817 in Harlens, Lawrence Co., PA. Her mother died seven days after childbirth. She is listed in the 1880 census for W. Lackawannock Twp., Mercer Co. with her father. Then there are no records until the 1910 census for Vincennes, Knox Co. Indiana. The 1888 History of Mercer Co. mentions that she was living in Illinois. I remember going to Vincennes to visit her and a much younger stepbrother, John, when I was a child. I wish I had asked about her while my parents were alive. Where was she all that time? being raised by relatives? or what? If anyone has any knowledge of her or has a census index for Illinois and/or Indiana for any of the years between I would appreciate a look-up. Thanks!!