Birth and death dates are from his tombstone.
Marriage record in Maryland for "Nathaniel Willcocks and a certain Tobitha Alexander".
21 April 1808 Administration and Guardian Bonds, Cecil County, MD, #184, p. 312: This day received of James Ratliff, a full settlement of all my legecy left me by my mother Elizabeth Wilcox to the amount of five hundred ninety dollars and seventy five cents with all the interest due to this day. I say received by me Nathaniel Wilcox (signed), witness present John Kirk. Recorded and examined by D. Smith, Register. (this was a week after he turned 21)
1810 Pencader Twp, New Castle Co, DE: male 1=16-26 fem 1<10, 1=16-26
He moved his family from New Castle Co, Delaware on 18 June 1817 and settled in Belmont Co, Ohio on 4 July 1817.
1820 Richland Twp, Belmont Co, OH:
male 4<10, 1=10-16, 1=26-45, 1>45 (2 in Agr)
fem 1=26-45, 1>45
1830 Goshen Twp, Belmont Co, OH:
male 2=5-10, 3=10-15, 1=15-20, 1=20-30, 1=40-50, 1=60-70
fem 2<5, 1=10-15, 1=30-40, 1=70-80
1840 Wayne Twp, Belmont Co, OH:
male 2=15-20, 1=50-60
fem 3=10-15, 1=50-60, 1=80-90

From the census records, it appears that her parents lived with them starting in 1820 and that the father died 1830-1840, the mother 1840-1850.
When Jesse Brannon (Tabitha’s brother-in-law) died or thereabouts he appointed Nathaniel Wilcox as guardian to his two youngest daughters.
The Somerton Methodist Old Northern cemetery is located about 100 yards from the intersection of County Rd 102 and U.S. 800 behind some property and is in poor repair and not very visible from the road; as reported by James Wilcox when he visited it in 2001.