Two thoughts occur to me. One is that there were certainly some Jewish slave owners and we know that slave owners often had children by their female slaves.  The second is that Burgess, while not a Jewish name, could easily be an Anglicization of Berger. Just guessing here but both seem probable.
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Veronica Zundel, London
Searching descendants of Josef Jakob Horoschowski b. 1905 Drohobych