15 degrees or steps of separation. James Taylor, ancestor of former presidents James Madison and Zachary Taylor, is an ancestor of mine. Zachary Taylor's daughter, Sarah Knox Taylor, was Jefferson Finis Davis's first wife. Sarah died young, they had no issue, and so there is no known, keyword known, blood relationship between us otherwise. Sarah Knox Taylor Davis, on the other hand, is my 4th cousin 5 times removed, or half 4th cousin 5 times removed as it was through another wife of the aforementioned James Taylor. However, as I am descended from James Taylor on both sides of my family, paternal and maternal, this makes me twice a half 4th cousin 5 times removed with Davis's first wife.