Thanks, I did have the marriage. Found this will this week: JOHN PARKER, 17 Jan. 1791, probate, Jan, 1792. Wife, Mary, step-daughter, Maryann Coons(Prince William's wife), children: John, William, James and DIANNA.
Source: WILKES COUNTY, NORTH CAROLINA WILL ABSTRACTS, BOOK ONE (1776-1799), Compiled by Mrs. W.O. Abshier and Samuel E. Sebastian.
Don't think there is any doubt that this is the father of Dianna Parker that m Isham Aldridge.