|I am nearly certain that Rivka-Feige was the Pikholz and that she was
born in Skalat.
Isak Fischel was probably from Podkamen and that is where they lived. I have no idea who his parents were and what his family surname was.
I am nearly certain that Rivka-Feige's parents were either Itzig-Josef and Rojse, or Motie and Taube. If Motie and Taube are her parents then Itzig-Josef and Rojse might have been her grandparents.
The surmise from the RISS Puzzle gives weight to Motie-Taube as her parents.
For more on this, see the Skalat conjecture.