That would be great. Almost all of the Siweks to whom I am related come from Ryglice and a few towns nearby and those that came to the U.S. settled in Chicago. Don't know where Sosnowiec is. If you can find out if any of their ancestors came from Ryglice you can establish a tie in to the family tree I compiled. Siwek is not that common a name.
Good luck.
Robert