1900 U.S. census, Nebraska, Platte County, Joliet Township, Postville, ED 166, sheet 7, 13 June 1900
Dwelling 119, family 112
Olsofka, Thomas, head, born 1844, age 56, married, married 37 years, born Poland Aus, parents born Poland Aus, immigrated 1884, alien, farmer
Olsofka, Hannah, wife, born 1844, age 56, married, married 37 years, mother of 10 children, 4 children living, born Poland Aus, parents born Poland Aus, immigrated 1884
Olsofka, Joseph, son, born June 1886, age 13, single, born Illinois, parents born Poland Aus
Olsofka, Hannah, daughter, born Jan 1889, age 11, single, born Illinois, parents born Poland Aus

Enumerated with son Joseph in 1910
1910 U.S. census, Nebraska, Platte, Humphrey, ED 184, sheet 5B, 21 April 1910
Dwelling 92, family 92
Olsufka, Joseph M., head, age 23, married once, married 4 years, born Illinois, parents born Austria Poland, farmer, general farm
Olsufka, Elizabeth, wife, age 26, married once, married 4 years, born Austria Poland, parents born Austria Poland, immigrated 1904
Olsufka, Charlie, son, age 4, single, born Nebraska, father born Illinois, mother born Austria Poland
Olsufka, John, son, age 3, single, born Nebraska, father born Illinois, mother born Austria Poland
Olsufka, Joseph, son, age 2, single, born Nebraska, father born Illinois, mother born Austria Poland
Olsufka, Katharine, daughter, age 9/12, single, born Nebraska, father born Illinois, mother born Austria Poland
Olsufka, Thomas, father, age 64, married once, widower, born Austria Poland, parents born Austria Poland, immigrated 1885, naturalized

Children of Joseph OSLOWKA and Elizabeth KRUK:

Stanislaus Joseph \ Stanley was born 7 Aug 1905 in Nebraska and bapized at St. Michael's Church, Tarnov, Platte County, Nebraska  He married Tekla.  Stanislaud died Aug 1969.

Social Security Death Index Entry http://ssdi.rootsweb.ancestry.com/cgi-bin/ssdi.cgi
STANLEY OLSOFKA, born 07 Aug 1905, died Aug 1969, last residence 60647 (Chicago, Cook, IL), last benefit (none specified), SSN 344-05-9577, issued Illinois

John Joseph was born 21 Dec 1906 in Nebraska and baptized at St. Michael's Church.  His mother's obituary noted that John predeceased her.  John's mother died 28 Mar 1968.

Joseph Aloysius was born 1 Mar 1908 in Nebraska and baptized at St. Michael's Church.  Joseph died Oct 1968.

Social Security Death Index
JOSEPH OLSOFKA, born 01 Mar 1908, died Oct 1968, last residence (not specified), last benefit (none specified), SSN 725-14-9357, issued Long-time or retired railroad workers

Catharina Maria was born 17 Aug 1909 in Nebraska and baptized at St. Michael's Church. Catharina married Frank \ Francis KOTAPKA.  She died Mar 1979.

Social Security Death Index
CATHERINE KOTAPKA, born 17 Aug 1909, died Mar 1979, last residence 60609 (Chicago, Cook, IL), last benefit 60609 (Chicago, Cook, IL), SSN 346-10-6606, issued Illinois
Possible Social Security Death Index entry for her husband Frank.
FRANK KOTAPKA, born 25 Jul 1908, died May 1981, last residence 60609 (Chicago, Cook, IL), last benefit 60609 (Chicago, Cook, IL), SSN 340-10-2958, issued Illinois

Veronica \ Verna was born 23 Jan 1911 in Nebraska and baptized at St. Michael's Church.  She married Mike Louis KIRIAZIS of Constantinople, Turkey.

Cook County, Illinois Marriage Index, 1930-1960, Ancestry.com
Verna C Olsofka, date of marriage 9 Jun 1934, spouse Mike Kiriazis, marriage location Cook County, IL

Social Security Death Index
VERNA KIRIAZIS, born 23 Jan 1911, died Jun 1987, last residence 60605 (Chicago, Cook, IL), last benefit (none specified), SSN 334-56-3071, issued Illinois

Cook County, Illinois Death Index, 1908-1988, Ancestry.com
Name:  Verna C Kiriazis
Death Date:  25 Jun 1987
Death Location:  Cook County, IL

Michael was born 24 Jan 1912 in Nebraska and baptized at St. Michael's Church.  He died Feb 1979.

Social Security Death Index
MICHAEL OLSOFKA, born 24 Jan 1912, died Feb 1979, last residence 60635 (Elmwood Park, Cook, IL), last benefit 60622 (Chicago, Cook, IL), SSN 346-01-0954, issued Illinois

Frank was born about 1914 in Illinois.

Julia was born 5 Jun 1916 in Illinois.  She married Peter Elgin in Cook County, Illinois, on 18 Feb 1943.  Julia died 27 Feb 2006.

Cook County, Illinois Marriage Index, 1930-1960, Ancestry.com
Julia Olsofka, married 18 Feb 1943, spouse Peter Elgin, marriage location Cook County, IL

Social Security Death Index
JULIA M ELGIN, born 05 Jun 1916, died 27 Feb 2006 (V), last residence 60707 (Elmwood Park, Cook, IL), last benefit (none specified), SSN 338-03-3152, issued Illinois

Possible Social Security Death Index entry for Peter:
PETER ELGIN, born 12 Jul 1915, died Mar 1986, last residence 60635 (Elmwood Park, Cook, IL), last benefit 60635 (Elmwood Park, Cook, IL), SSN 282-09-6588, issued Ohio

Martin was born about 1918 in Illinois.  He married Elizabeth BECKER on 8 Nov 1951 in Cook County, Illinois.

Cook County, Illinois Marriage Index, 1930-1960, Ancestry.com
Martin Olsofka, marriage date 8 Nov 1951, spouse Elizabeth Becker, marriage location Cook County, IL

Thomas was born about 1920 in Illinois.

Anna was born about 1923 in Illinois.  Her mother's obituary noted that Anna predeceased her.  Anna's mother died 28 Mar 1968.

Sophia K. was born 17 Aug 1924 in Illinois.  She married Nobuo J. \ Jack OZAKI in Cook County, Illinois, on 23 Jun 1956. Jack was born 27 Sep 1922. Sophia died 21 Jun 1995; Jack died Aug 1971.

Cook County, Illinois Marriage Index, 1930-1960, Ancestry.com
Sophie Olsofka, marriage date 23 Jun 1956, spouse Nobuo J. Ozaki, marriage location Cook County, IL

Social Security Death Index
SOPHIE K OZAKI, born 17 Aug 1924, died 21 Jun 1995, last residence 60714 (Niles, Cook, IL), last benefit (none specified), SSN 350-16-2710, issued Illinois

Social Security Death Index
NOBUO OZAKI, born 27 Sep 1922, died Aug 1971, last residence (not specified), last benefit (none specified), SSN 546-18-9777, issued California

1920 U.S. Census, Illinois, Cook County, Chicago, ED 987, page 3B, 3 January 1920
1018 Erie St., dwelling 15, family 35
Olsofka, Joseph, head, age 34, married, born Illinois, parents born Austria, machinist, punch press
Olsofka, Elizabeth, wife, age 37, married, immigrated 1890, naturalized, born Austria, parents born Austria
Olsofka, Stanley, son, age 14, single, born Illinois, father born Illinois, mother, born Austria
Olsofka, John, son, age 13, single, born Illinois, father born Illinois, mother, born Austria
Olsofka, Joseph, son, age 12, single, born Illinois, father born Illinois, mother, born Austria
Olsofka, Katie, daughter, age 9, single, born Illinois, father born Illinois, mother, born Austria
Olsofka, Barnard, son, age 8, single, born Illinois, father born Illinois, mother, born Austria
Olsofka, Michael, son, age 7, single, born Illinois, father born Illinois, mother, born Austria
Olsofka, Frank, son, age 5, single, born Illinois, father born Illinois, mother, born Austria
Olsofka, Julia, daughter, age 3 4/12, single, born Illinois, father born Illinois, mother, born Austria
Olsofka, Martin, son, age 1 2/12, single, born Illinois, father born Illinois, mother, born Austria

1930 U.S. census, Illinois, Cook County, Chicago, ED 1116, sheet 17B, 18 April 1930
941 North Hoyne Avenue, dwelling 132, family 349
Olsofka, Elizabeth, head, age 47, widow, born Poland, parents born Poland, immigrated 1904, naturalized, janitress, office building
Olsofka, Stanley, son, age 24, single, born Illinois, father born Illinois, mother born Poland, die setter, radio parts co.
Olsofka, John, son, age 23, single, born Nebraska, father born Illinois, mother born Poland, wrapper, newspaper
Olsofka, Joseph, son, age 22, single, born Nebraska, father born Illinois, mother born Poland, chauffer, cooperage
Olsofka, Catherine, daughter, age 21, single, born Nebraska, father born Illinois, mother born Poland, packer, candy factory
Olsofka, Veronica, daughter, age 19, single, born Nebraska, father born Illinois, mother born Poland, packer, candy factory
Olsofka, Michael, son, age 17, single, born Nebraska, father born Illinois, mother born Poland, assembler, radio factory
Olsofka, Frank, son, age 16, single, born Illinois, father born Illinois, mother born Poland, messenger, florist
Olsofka, Julia, daughter, age 13, single, born Illinois, father born Illinois, mother born Poland
Olsofka, Martin, son, age 12, single, born Illinois, father born Illinois, mother born Poland
Olsofka, Thomas, son, age 10, single, born Illinois, father born Illinois, mother born Poland
Olsofka, Anna, daughter, age 6 9/12, single, born Illinois, father born Illinois, mother born Poland
Olsofka, Sophia, daughter, age 5 8/12, single, born Illinois, father born Illinois, mother born Poland

Obituaries from Dziennik Chicagoski - Index at PGSA.org
After a short illness, Joseph OLSZOWKA died on 7 January 1925 at 7 a.m. at the age 40. His address was 684 N. Carpenter Street. His funeral was Saturday, 10 January, at 10 a.m. at St. John Canty church, with burial at St. Adalbert Cemetery. Survivors were his wife Elizabeth, and children Stanislaus, John, Joseph, Katherine, Veronica, Michael, Francis, Julianna, Martin, Thomas, Anna and Sofia. Elizabeth OLSZOWKA nee KRUK, wife of deceased Joseph, and mother of deceased John, Anna and Jacob.  After a severe illness, Elizabeth died 28 March 1968 at 5:50 a.m. Her funeral was on Monday, 1 April, at 9 a.m. from the Laskowski funeral home to St. Helen Church, with burial at St. Adalbert Cemetery. Survivors were daughters and sons, Stanislaus, Joseph, Katharine Kotapka, Verna Kiziaris (s/b Kiriazis), Julia Elgin, Michael, Francis, Martin, Thomas and Sofia Ozaki; daughters-in-law, Tekla, Emilia, Jeannette and Betty; sons-in-law, Francis Kotapka, Peter Elgin and Jack Ozaki; grandchildren and great grandchildren; and sister Kate Zywiec.