Husband, wife and adopted son and his wife.
Grave marker at Münstermaifeld, Mayen, Palatinate, Germany.
Husband: Waldmar Kosak, born 1899, Opatsch, Bender, Bessarabia, Russia, son of Johannes Kosak.
Wife: Felicitas (Müller) Kosak, born 1905, daughter of Karl and Ursula (Dirk) Müller.
Adopted son/husband: Josef Wagner Kosak, born 1934, Emmental, Bender, Bessarabia, Russia, son of Zachäus and Rufina (Müller) Wagner.
(Rufina was sister to Felicitas.)
Josef’s wife: Margarete (Pitsch) Kosak, born 1936.
[Zachäus son of Stanislaus and Aurora (Plotzki) Wagner.
Karl, Ursula, Stanislaus and Aurora born in Krasna, Akkerman, Bessarabia, Russia.]

Source: Ralf Nagel
https://ofb.genealogy.net/famreport.php?ofb=krasna&ID=I3780&nachname=KOSAK