I believe Agnes Sieja is the same Agnes listed in the 1910 census as 'Agnes Siza' or 'Siga'. She is listed as living with John and Mary Roznowski on Wenona St. and is related to John as 'mother in law'. Here is the list:
John Roznowski 44 Mary Roznowski 26 Agnes Roznowski 19 Frank Roznowski 16 Michael Roznowski 11 Stanley Roznowski 9 Rosie Roznowski 7 Eliza Roznowski 4 Walter Roznowski 1 7/12 Agnes Siza 80
Walter listed above is my grandfather and I think they listed Mary's age wrong. I have a copy of this census so I can email it to anyone if they wish.