I'm puzzled by your statement that Frank Siwek is buried in "St. Patrick's Cemetery (Lot 24)in Prattsburgh, NY". I checked that cemetery at both the Steuben County GenWeb site and the Painted Hills Genealogy site and neither list an Siwek in that cemetery. I am curious about where you got this information.

Did Franciszek/Frank Siwek have 2 sisters, one named Stefani Siwek b. abt 1882 and one named Stanislawa Siwek b. about 1886? All from Ryglice?

A found this siwek family in the 1910 Census of Philadelphia Ward 36 (ED 901), Philadelphia Co., PA:

Frank Siwek.....Head 28 M1: 2yrs...Austria-Polish
Victoria........Wife 26 M1: 2yrs...ch: 1/1 Austria-Polish
Stephen.........Son 4/12 PA
Stefani.........Sister 24 S Austria-Polish
Stanislawa......Sister 22 S Austria-Polish

I have not found members of this family in the 1920 or 1930 Censuses.

I also found immigration records for this family.

I also found an immigration record for a Franciszek Siwek who was going to "NY, Alpha", a place that I cannot locate on any map.

Halsey