I am pretty sure I am also a descentdant of Whitfield Monroe Parker. My grandmother, Lou Birdie Parker, is most likely one of his daughters. I have found her name in various censuses in the Washington County VA area as Lizzie. B, Lu Birdy, Lou, Louise.
The is a record of a marriage between her and James H Snyder. My father's social security application from Bristol TN lists his parents and James Harvey Snyder and Loubirdie Parker.
I would be interested in further research you have on this family line.
Thanks,
Kaye Evans