I found them in Ray Township, Franklin County IN in the 1850 census. They have his middle initial wrong, but you know how the census goes. He is with his parnets:

Eliska Davis 58
Elizabeth Davis 54
John L Davis 18
Lydia A Davis 16
Elisha Davis 9

I have done research on the DAVIS name in Union County because there are 4 different families. The name ELISKA is NOT a Union county name. Your best bet would be Franklin County where the name DAVIS is almost like SMITH.

KACoffey