I don't know if this helps but there is a John Emmert & Lydia Emmert as inmates at the Old Peoples Home of ? Church in Mt. Morris Township, Ogle co., IL in the 1900. John born Apr 1830 MD and Lydia born Jan/June 1840 in IL. 1900 Ogle Co, Roll 333, book 1, Mt Morris Township, pg 227a
There is a John J Emmert in the 1870 Freedom Twsp Carroll Co. but is not yours. He is married to Catherine and has 1 son. David Frank is also living there.