LDS records have a duplicate family which mirrors John and Mary's exactly but the dates are much earlier, making them too old for succeeding generations.
VA estate records used as documentation for John's death date as about 1695 must belong to another man by the same name, perhaps an uncle. DAR records use the same date. LDS records have his marriage date as 1695 and all the children were born later, the more plausible interpretation.
John's will was dated 3/22/1750 and recorded 7/2/1761. It named his 7 children, wife Mary, and grandson William Whitley and son Nathan as Executor. Witnesses were Robert and William Edwards.