Michelle, I know it's been a while & you may have found this info already, but I thought I'd send it along to you. I know there is someone looking for the family of an Edward Pozek, which might be your Stephen's son - Edward.
1930 United States Federal Census
Name: Stephen Pozeg
Home in 1930 (City,County,State) Pittsburgh, Allegheny, PA
Age: 42
Estimated birth year: 1887
Birthplace: Czechoslovakia
Race: White
Head of Household
Wife: Hermina, 34, Estimated Birth Year: 1895
Daughter: Anna Pozeg, 13, Estimated Birth Year: 1916
Son: John Pozeg, 11, Estimated Birth Year: 1918
Son: Edward Pozeg, 9, Estimated Birth Year: 1920
Daughter: Rita Pozeg, 5, Estimated Birth Year: 1924
Son: Robert Pozeg, 4 4/12, Estimated Birth Year: 1925
Source Information:Ancestry.com. 1930 United States Federal Census. [database on-line] Provo, UT: Ancestry.com, 2001-. Indexed by Ancestry.com from microfilmed schedules of the 1930 U.S. Federal Decennial Census.1930 United States Federal Census. [database online] Provo, UT: Ancestry.com, 2001. Data imaged from National Archives and Records Administration. 1930 Federal Population Census. T626, 2,667 rolls. Washington, D.C.: National Archives and Records Administration.