1880 Census, Pinhook Twp., Robertson Co., KY, p. 318A1395
Jacobs, J. H., 55, b. KY, parents b. KY, farmer
Martha, wife, 53, b. PA, parents b. PA, keeping house

based on the 1880 Census, the children currently listed for Martha and Jonathan are not correct. They are for John N. & Rebeca Jacobs, who are much younger. Is John N. Jacobs the son of Martha and Jonathan?