Update 4/2016 ( I mis-typed the above)
My grandmother, Antoinette Harmatiuk, always told the story that her mother died, her father remarried, and the stepmother wanted his 3 kids out of the house as soon as possible. Antoinette and her sister, Anna, list Jadwiga Sztokajlo as their mother in immigration documents. Assuming this is their birth mother she would have died 1898-1900, as Onufry died in 1901. Currently it appears Onfry married another Jadwiga who then remarried a Skiba, and I believe the information on the 2 were construed as the same person.