Uknown.
Ilona Szilárd is recorded as the mother of Elemér Szilárd (born Kaufmann) on the ID card: https://www.familysearch.org/ark:/61903/3:1:33S7-95B8-SV4X?i=187&cc=1932363
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F > Fisch | S > Szilárd > Ilona (Fisch) Szilárd