Niewiadomski Sobanska

I am looking for relatives of my great grandmother's sister ;
KATARZYNA NIEWIADOMSKA (KATHERINE NIEWIADOMSKI)maiden name SOBANSKA, born 8 September 1875 in Sawilno.Parents; Tomasz and Franciszka Sobanski.With her husband Michael Niewiadomski she emigrated from Poland to United States and they lived in Chicago,Illinois.
Children of Katherine and Michael Niewiadomski
Stanley Niewiadomski
Isabella Niewiadomski
Helena Niewiadomski ( wife of Max Joseph Hansen)
Chester Niewiadomski
Mary Niewiadomski
http://slaveksobanski.tripod.com/