Are you still there and looking for information on William Sheppard? In the 1850 census, in Prince Wms Parish, P. 45: #139: Wm. Shepherd, 32, Ann 30, Jane 10, Mary 8, William 3, Ann 5 months.
Is this little boy your William? I think this older William Sheppard may be one of the brothers of my Ephraim Sheppard, whose father was Robert Sheppard (wife Eve, who married 2nd, J. Zahler) Where is Maye River cemetery?