Mother-in-law and son-in-law. Grave marker at Namedy, Mayen-Koblenz, Palatinate, Germany.
Mother-in-law: Anna Maria (Schwab) Kopp, born 1865, Speier, Beresan, Odessaa, Russia.
Married Georg Kopp.
Son-in-law: Peter Mattern, born 1906, Kandel, Kutschurgan, Odessa, Russia, Kaspar and Elisabetha (Bleischwitz) Mattern.
Married Katharina Kopp (daughter of Georg and Anna Maria).
[Katharina born in Emmental, Bender, Bessarabia, Russia. George born in Karlsruhe, Kutschurgan, Odessa, Russia.]

Source: Ralf Nagel
https://ofb.genealogy.net/famreport.php?ofb=krasna&ID=I3731&nachname=KOPP

https://ofb.genealogy.net/famreport.php?ofb=krasna&ID=I3869&nachname=Mattern