from CADI:
SWAROWSKY MARTHA 10/08/1894 F MASSACHUSETTS SACRAMENTO 09/02/1964 69 yrs Add
SWAROWSKY RUDOLPH H 02/07/1887 SWARTZER M EL DORADO 06/09/1966 79 yrs Add
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You wrote on the CADI site
This is my sons great grandfather. His son Rudolph Thomas Swarowsky was killed in action during WWII. We know he had a step sister named Ruth, a sister by the name of Elaine, and a half sister whose name I can't remember at this time.

There are no births in the CABI for SWAROWSKY. You might ask for help with an obituary on both of the above deaths - it might give you surviving family members names.