Hello Frantisek,

if you knew, where Agata lived, you may find a hint for finding the ancestor 'involved'. Plus: young Jewish women usually would rather work in/for a Jewish and not for a Christian family. A maid normally lived with the family and she would have had to register when she moved to Oberhausen and took up work. Oberhausen has a city archive and they seem to have kept the population registers (Melderegister). But even if you find the family she worked for: the father of the child could bee a friend of the family, a neighbour, a co-worker...

Good luck for you further research! Regards from Germany

Corinna (Wöhrl) - Hamburg/Lübeck
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Bgm./Stadt 1861 - 1933
(2.740 VE), Findbuch: mit den Provenienzsplittern Bgm. Dümpten 1876-1920 (9 VE) u. Bgm. Borbeck 1858-1910 (4 VE). - Protokolle ab 1862; Etats ab 1862; Zeitungs-berichte ab 1854, Verwaltungsberichte ab 1862; Meldekartei 1862-1891, Melderegister ab 1879. 3)
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https://www.oberhausen.de/de/index/kultur-bildung/bildung/stadtarchiv.php
Stadtarchiv Oberhausen

E-Mail: stadtarchiv@...