John Fikes was most certainly the son of Philip Adam Fikes and Margretha Wick. John's family is readily available on Internet sources, including FamilySearch.org. If you have trouble tracking them down, let me know and I will gladly give you what I have.
Philip Adam Fikes was born about 1740. The earliest reference we have for him was as a baptism sponsor in 1756. We think Philip was the son of Peter Fikes, the Palatine immigrant to the Mohawk Valley of New York. He is mentioned as a tenant of Sir William Johnson's in 1764. Philip had several brothers, all of whom were Loyalists during the Revolutionary War. Philip however, is listed as a member of the Tryon County Militia, 2nd Regiment. He may have been influenced by his wife's family who were Patriots.
Philip and Margretha had several children. Including Henry, born 30 July 1774, Adam, born 14 Sept. 1778, and twins, Michael and Lana (Magdalena), born 5 April 1785.
John was born in 1771. I do not have a baptismal reference for his birth. However there are several connections to the known sons of Philip and Margretha, including the baptismal sponsorings of each other's children.
In the 1810 census for Minden township, Montgomery County, NY, John is listed as living between the farms of of Michael and Adam. Surely a preposterous coincidence if they were not related.
If you wish any more information on the family, please email me.