Jan is a first name in Polish, Slovak for John in English. Have you tried requesting Zofia's naturalization?Having her place of birth might lead you to the original spelling of BROSKI.
No luck location Zofia's arrival manifest in Baltimore, Boston or Philalephia port?
No middle name in old country so are we looking for Jan or Andrzej?
Anything new in 1940 census on the above ancestors?
Remember: birds of a feather fly together. Our ancestors married within same region, religion [few exceptions] but for sure common language to communicate in and common traditions to observe.To me Zofia GACEK seem like she was Byzantine Catholic and John Andrew BROSKI a Roman Catholic.Anything on their tombstone?