Yitzchak Yaakov Karl Koppel and Feiga Rosenfeld Weiss Headstone. See notes.

Markus Weiss had this monument erected at great expense after the war probably in Vienna, Austria. Even though his father Yitzchak Yaakov Koppel and his sister Pessel were murdered in the gas chambers and buried in a mass grave, his mother Feigel died before the war and has a separate grave headstone.

Their yahrzeit is Gimel Elul. A tree was planted for them in 1955. Markus got a yahrzeit notice for kaddish on August 17, 1977 which corresponds to gimel Elul.

1. Why wasn't Yisroel Viktor or Miriam included on this headstone?
2. Is this in the same cemetery as Faiga's tomb? If so, why include her on the headstone?