I found the ship manifest for the CAP ROCA which left Hamburg Germany on May 2, 1911.
The IWANCZUK family members listed on the manifest are:
1. Aleksander, born 1893, son
2. Franciszek, born 1860, father
3. Jan, born 1908, son
4. Malgarzata, born 1899, daughter
5. Mariana, born 1867, mother
6. Michel, born 1896, son
7. Roman, born 1904, son
I believe the CAP ROCA sailed from Hamburg to Lisbon, then Rio De Janiero. The Hamburg - South American line used to sail from Europe to South America. I haven't found anything to show the arrival of IWANCZUK in the U. S.
If you are related to these IWANCZUKs, contact me.