Thanks so much for that!
I didn’t know that Opole Lubelskie residents were sent to Treblinka. I had heard of Poniatowa before but unsure how to trace people since the official sources have no records.
I’m looking for clues in my family letters and sometimes they reference other people. (I am wondering if any other letters reference my ggf.) Do you know if any letters or photos survived in your family? (My email is moshebermann+jewishgen@..., if you’d rather not answer that publicly.)