"Where can I obtain more info According to my deceased paternal grandmom, he was an uncle to her mom Mary Karwarczyk, from Warsaw. Mary settled in Mass, late 1800
Sandra Rockwood Ruscetta"
Sandra, you should begin by getting biographies of Pulaski -- your library has some, and will get more if you ask -- and by checking encyclopedia entries on him to get the names of his parents, and, most importantly to you, his siblings. Your great-grandma Mary must have been his niece through one of those siblings.
You should also read this article:http://www.msnbc.msn.com/id/8308992/
which is an Associated Press report dated June 21, 2005 titled "Revolutionary War mystery still unsettled: DNA results fail to resolve question about hero’s fate ". Try to get in touch with Dr. James C. Metts Jr., the Chatham County coroner (based in Savannah, Georgia), who tried to find descendants of Pulaski to use their DNA to confirm that the bones recently reburied really are the bones of Casimir Pulaski. (See other posting here regarding the reburial).
Dr. Metts produced a 2005 report which will probably have all the known detail on the genealogy of Casimir Pulaski. You have a right to a copy of the report, which has been made public, but the County may have to charge you for copying and mailing it.
See also the photo I have attached here, with information about the Polish village of Promna, where some of Pulaski's relatives are buried. Knowing the name of the town may help you as your research progresses.
The photo is copied here under the Fair Use provisions for non-commercial research use, qualifying under subsections (1) - (4) of U.S. Code Title 17 Chapter 1 Sec. 107 regarding copyrights.
That is where you start! The DNA report should be wonderfully helpful. Best wishes on your search, Lisa