In a "former life" I used to be a cryptanalyst, and when things did not come out we said the code had been "hammered" or was unreadable.
Taking the misspelling of Hobrock as "Hobroke" I ran some more checks. Sure enough, in the 1840 Census we have a "Glos Heinrich Hobroke" in Adams County, Indiana:
Male 50-60 1 Female 40-50 1 Male 0-5 1 Male 5-10 1 Female 5-10 1 Female 10-15 1
In 1850, we now have family group #306 in Root Township, Adams County, Indiana:
Nicholas H. Holbrook 59 born in Germany Farmer Mary E. Holbrook 45 born in Germany John W. (William) Holbrook 18 born in Germany Laborer John H(erman) Holbrook 11 born in Germany John H. Holbrook 7 born in Indiana John F. Holbrook 4 born in Indiana Anne E. Holbrook 1 born in Indiana
So that this would be the Nicholaus Heinrich Hobrock family at that point in time. Interesting that if John Herman (my ggrandfather) was born in Germany then they probably would have come over in 1839 or he was born in 1838; he himself and the rest of his family were sure it was 1839.
Amazing what happens when you stretch the names a bit!