Genealogy / Dodolak Family [3]

My grandfather's name was Walenty (Valentine) Dodolak born 1899. He came to the USA in 1913 and ended up in Lackawanna NY. From various papers I have found he came from Trzebownisko, Poland and had 5 siblings Stanley, Joseph, Mary, Veronica and Catherine. As best as I can determine Stanley was the only other sibling to settle in the USA, Dubois PA. While searching your forum I came across a web site "Friends Of Trzebownisko " and see his name on there as contributing money to St. Joseph Staromiescu church for help in purchasing bells along with many of his neighbors from here. Can anyone suggest a next step or a place in Poland to continue my search on his family there? As many have mentioned on your forum my grandparents never spoke much about their time back home so I'm at a bit of dead end. Any help or suggestions would be greatly appreciated. Thank You in advance!