Beverly,
This may be your John & Nancy Case in 1850:
1850 District 45,
Harrison Co., Indiana
Enumeration Date: October 11, 1850
Page: 351
Line: 24
Dwelling/Family: 988/988
Case, John - age 31, farmer, born in IN
" Nancy - age 23, born in IN
" Rovila A. - age 1, born in IN
Bird, Mary - age 20, born in IN
It could prove difficult to locate John Case or Nancy Bird in their parents household prior to 1850, because the head of household was the only one listed by name on the US Census. Other occupants were listed as male/female in their specific age groups.
I hope this helps.............................Karen