The 1900 census shows Matthias and Margretha Pontius, Chicago, Cook County, IL

Matthias Pontius, b. 1856 in Germany,

Margretha, b. c1860

Maria Pontius, b. 1c1885

Elisabeth Pontius, b. 1887

Anna Pontius, b. c1890

Bernhard Pontius, b. c1892

Theodore Pontius, b. c1894

Matthias Pontius, b. c1895

In 1910, Matthias is missing.  The listing in Chicago Ward 23, District 991, Cook County, IL is as follows:

Orchard Street

Family 195

Pontius, Margareth, head, age 50 - had 7 children, 5 still living, born Germany

",  Elizabeth, daughter, 22, born IL

", Anna, daughter, 20, born IL

", Bernard, son, 18, born IL

 ", Theodore, son, 16, born IL

", Mathias, son, 14, born IL