The dates you have for your Martha Jane Offill don't seem to fit well with my info on James and Mary. I have Mary born circa 1814 in Kentucky, and married to James Offill circa 1832. Mary's birth and marriage dates would not allow her to have grandchilden in the 1830's.
The info I have on Martha Jane is:
Martha Jane Offill,b. Feb. 24, 1841 in Lawton Center, Carter Co., KY, d. March 5, 1910,buried at Pleasant Valley Cemetery, Carter County, Ky.. Martha married married Joseph Newman, b. Mar. 17, 1840, d. Aug. 5/6, 1911 buried at Pleasant Valley. Joseph was"of Virginia, and a school teacher". I have their children as:
Mary NEWMANb. before 1880 at Lawton, Carter, KY
Grace Augusta NEWMAN, b. Feb. 11, 1878 at Lawton, Carter, KY, d. Sept. 1940 at Huntington, , W Va, buriedat Pleasant Valley, Carter, KY.. Grace married John Cabel Breckenridge OFFILL on 14 Jan. 14, 1896 atMaddix Home, Carter, KY. John was b. March 29, 1873at Pleasant Valley, Carter, KY. John d. Dec. 14, 1957 at Argillite, , KY and was buried at Pleasant Valley, Carter Co, KY. John was the s/o Gabriel Marion OFFILL &Mahala Honora PLUMBER. Grace was John’s cousin.
James NEWMAN, b before 1875 at Lawton, Carter, KY.
Ida NEWMAN b. before 1873 at Lawton, Carter, KY.
Coralee Counts NEWMAN b. 1871 at Lawton, Carter, KY,d. 1951 and buried at Oakland Cem, Carter Co, KY
I have come across the Spurlock name in Carter County, but do not have any links to them that I know of.
I do have a sister to James Offill named Mary "Polly" Offill who was born in 1797, but I have her married to James S. Elliott.