I am also looking for information for Nicholas and Loretta Acker, the very same family you're looking for.I, however, am loking for another reason.This family follows my ancestors, the Vande(r)verg family around for 30 some-odd years, and I'm curious to know if Loretta was a Vanderverg/Vandeverg.
I came across the family in the same censuses as you did, and noted that Stephen, being the only son, was b. ca 1838, if I remember correctly.
I don't know if you have access to later censuses, but I do, and if you need me to, I can look to see if Stephen is shown in later censuses.Just give me your great grandmother's name, and I'll do a lookup for you....also what year she was born and where. Did she marry and to whom?Did she have siblings and who were they, if you know?
Lastly, do you know of the Vandeverg/Vanderverg connection I'm persuing? If not, thanx anyway.
Will wait for your response on your gt-grandmother.