We deduced that Ketura's father was John and her mother was Elizabeth from the 1860 census record:
1860 Lack Twp, Juniata, PA Enoch Lutes age 24 Katura age 24
right next to
John Kepner age 40 born PA Elzabeth age 40 Derwin age 18 student Frences age 17 Jackson age 14
And if you go to the 1850 census in the same location you find: 1850 Lack Twp, Juniata, PA J Kepner age 39 female E Kepner age 36 female C Kepner age 15 female E Kepner age 9 male F Kepner age 7 female J Kepner age 5 male R Kepner age 3/12 R Hirsh/Fish age 14 male S. McCahan age 24 female
Keturah was "Keturah Catherine" we believe, hense the C. Kepner. I worked over this for months with another researcher in San Diego. Yes, there is no proof, but the pieces fit pretty well. The name Lutz is spelled Lutes, and Loots, and Lootz in different census records.
Samuel Lutz and Sarah Meyers were my ggg grandparents.