I just talked about a similar case at the IAJGS 2016 conference in one my
What you could try is probate records for a family member (sibling?) whose
estate was administered after 1945, as the father and Rachel would have
The best would be to find the father's death record and based on that, find
the probate record (his estate would have been inherited by Rachel).
BTW, Rachel is a name that Hungarians use as a civil name as well, but she
might have another name, too (Roza, Rozsi, etc.).
genealogist/Historian/Private tour guide