Is this your family as found in the 1930 US Census for Kenosha?

Name Age
Joseph Istvanek 46 immigrated 1909 born Czechoslovakia
Mary Istvanek 42 " " "
Anna Istvanek 19 born Phildelphia
Joseph M Istvanek 15
Mother tongue listed as Slovak

Next door was the John and Frances ISTVANEK family

And the 1920 Kenosha census concurs with this info

Name Age
Joseph Istvanck 35 immigrated 1909 Slovakland
Mary Istvanck 32 " "
Mary Istvanck 10 " "
Annie Istuavek 9 born PA
Joseph Istuavek 5 born WI
Mother tonuge Slovak

Perhaps this is the (extended) family as found in the 1910 Philadelphia census

Name Age
John Istranck 50
Modier Istranck 44
Joseph Istranck 27 immigrated 1908
Mary Istranck 24 immigrated 1908
John Istranck 20
Stephen Istranck 18
Annie Istranck 16
Michael Istranck 13
Josephine Istranck 9
Edith Istranck 4
Mary Istranck 23
Mary Istranck 11/12
[0]
Language spoken Magyar

Josef's ship manifest lists his Race as Slovak....

Name: Josef Istvanik
Arrival Date: 22 Nov 1909
Age: 26 Years
Estimated Birth Year: abt 1883
Gender: Male
Race: Slovak (Slovakian)
Port of Departure: Liverpool, England
Ship Name: Merion
Port of Arrival: Philadelphia, Pennsylvania
Friend's Name: James Istvanik
Last Residence: Hungary
Birthplace: Uj Pest, Hungary
Traveling with Marya wife and 8 month old daughter Marya
Destination to father Janos at Philadelphia

About Uj Pest
http://en.wikipedia.org/wiki/%C3%9Ajpest

Perhaps this is the father Janos (John) arriving at NY

Name: János Istványik
Arrival Date: 28 Aug 1907
Birth Year: abt 1860
Last residence: Budapest,Hungary
Birth Location : nagybessany
Age: 47
Gender: Male
Race­: Magyar (Hungarian)
Place of Origin: Magyar, Hungary
Port of Departure: Fiume
Port of Arrival: New York, New York
Ship Name: Slavonia

Perhaps Janos was born at Nagybörzsöny 32.1 miles NNW of Budapest near the Slovak border

http://en.wikipedia.org/wiki/Nagyb%C3%B6rzs%C3%B6ny

Robert