In the 1920 census in Climax, Kalamazoo, MI:Daniel O. Heeter and wife Elizabeth are living next to Oliver A. Heeter 46 and his family (wife Sadie A. 39 and son Donald L. 5).
In the 1930 census in Macomb Co, MI a widowed Daniel O. Heeter is listed as "father in law" in the hh of Milton A. Yoder 56 and his wife Hester 47 and their children.
If you search the web, I believe there is a marriage record online for Hanna Heeter and a ? Snyder in Kalamazoo Co.
In 1880, Daniel "C" (probably O) Heeter is living in Marcellus, Cass, MI with wife Elizabeth and son Oliver D. 6 and daughter Hannah E. 7/12 (says Daniel born PA, father born OH, mother born PA).
In 1870 in Flowerfield, St. Joseph, MI there is Daniel O. Heater 21 with Elizabeth 21 and William 1 (Daniel and Elizabeth born PA; William born MI).
A researcher has some info posted at the link below that shows Daniel's wife Elizabeth as Elizabeth ROMIG, d/o George and Hannah Romig (note:lists him as Daniel G. Heeter, but he is clearly Daniel O. Heeter in the various census info)