I found an obit in the Pittsburgh Press (Dec. 6, 1980) for Laura Gasiewski. If this is your great grandmother it states her siblings are George Orgal, Alice Konwalski and Helen Bakaj.
Alice Konwalski died in Pittsburgh January, 1981.
There is also an obit for Adam J. Orgal in the Pittsburgh Press (August 10, 1982)-it states his sister is Mrs. Helen Bakat.
In the Pittsburgh Directory 1917 Adam Orgal is living at 37 Roberts Way. Casimir Orendowski is also living at 37 Roberts.
If you go to familysearch.org you will find a few marriages in Allegheny County, Pennsylvania for the children of:
Joseph Konwalski and Alice Orendowska
Charles Bakaj and Helen Orendowska
You will also find a marriage for a Gertrude Orendowski-it says her father is Adam Orendowski.
Good luck in your search. Kathryn