I have a John LeMarr (also spelled, Lemar) who was born in 1827 according to his military records, in Ross County, Ohio. Highland and Ross Counties are adjacent to each other. I notice that your John in 1830 in Highland county has a son under 5 listed as living in his household. I know that if Mary was born in 1785, she would have been 42, pushing the limits, but not out of the question. Do you know if he had a son born in 1827?