Evelyn and Christopher Wilcock
Families of mixed Jewish/nonJewish descent in Germany will often be connected to non Jewish men who served in the German Army (conscripted) or who volunteered in 1938-1939 in the mistaken belief it might save their Jewish relatives. Men with one Jewish parent were also conscripted and served till 1942. Men with one Jewish grandparent may well have remained in the army after 1942 and have served until the end of the war. Or been killed in action.
Jewish refugees did escape to Argentina. The 1939 census database on line lists 1077 people who emigrated to Argentina (not all of them will be Jews).