Please repost your query on SLOVENIA's Ancestry board as this is Slovakia's board.http://feefhs.orgwww.familysearch.orghttp://genforum.com
You have their arrival manifest? Were they naturalized citizen? Did they marry in US? The children's church baptismal record should have parents place of birth. If these ancestors had social security numbers than the SS-5Form should have a place of birth and parents names. The research is in a LOCATION.