The Elusive Joseph Heisler

Conflicting census information!

1860 Census, Liberty Township, Dubuque, IA
Heisler, Nicolaus; age 54; born 1806, Bavaria
Heisler, Sophia; age 54; born 1806, France
Heisler, Joseph; age 23; born 1837, Pennsylvania
Heisler, Magdalena; age 18; born 1842, Pennsylvania
Heisler, Veronika; age 16; born 1844, Pennsylvania
Heisler, Margareth; age 15; born 1845, Pennsylvania
Heisler, Martin; age 13; born 1847, Pennsylvania
Heisler, Mary; age 11; born 1849, Pennsylvania

1870 Census, Minnesota
Heisler, Joseph; age 35; born 1835, Pennsylvania
Heisler, Nicolas; age 65; born in France
Heisler, Sophia; age 65; born in France
Heisler, Annie; age 20
heisler, Martin; age 23