I have copies of the cemeteries in Owen Co and found the following

SWETNAM, Robert Emmett, twin son of B. C. & A. L.; Feb 12 - 19, 1899
SWETNAM, Lucy Byrns, twin dau of B. C. & A. L.; Feb 12, 1899 - July 1899

SWETNAM, Tobias S.; Feb 13, 1839 - Sept 25, 1922
SWETNAM, Lucy; Feb 16, 1845 - Feb 4, 1915

There are aprox 25-25 Wilhoites listed who are you looking for? I can send you a list by attachment contact me by email. Barbara