Hi Thomas thank you for the reply. I have Nicholas T. Kosta's death certificate which says his father was named Frank Kosta, so I am kind of confused about the John Costa thing. The death certificate does not say where the father was born or the mother's name or place of birth. I am trying to establish a link between Nicholas Thomas Kosta born in 1874 and his father Frank Kosta. I have been unlucky until now. Do you have any idea? I am sure Frank Kosta emigrated from Austria but do not know if he ever changed his name. I have seen some Frank Kosta in Sacramento, CA and in Alameda, CA but there is no way to know for sure if these guys were Nicholas' father. There has to be some sort of documentation establishing the link for sure. Any more information would be great.