https://en.wikipedia.org/wiki/John_West_(colonel)
the parents of Thomas were John and Unity
Name: Colonel John West Residence Place: Virginia, USA
Comments: son of Captain John West, governor, etc., was born at "Bellfield," York river, in 1632, being the first child of English parents born on York river; lived at West Point; sat on the courts-martial that tried the rebels in Bacon's time; senior justice and colonel of the New Kent county militia; married Unity, daughter of Major Joseph Croshaw; burgess for New Kent county in 1685 and 1686. He had three sons--John, Nathaniel and Thomas, and one daughter--Unity, who married Henry Fox, of King William county.; ; IV--Burgesses and Other Prominent Persons Source I Virginia, Biographical Encyclopedia
Another source
"Delaware Town" and "West Point" in King William County, Va. Malcolm H. Harris
The William and Mary Quarterly Vol. 14, No. 4 (Oct., 1934), pp. 342-351 (10 pages) Published By: Omohundro Institute of Early American History and Culture