с ним обращались

treated him

→ с
phrase Rare #36,855
treated him The phrase means “treated him” or “dealt with him.” The verb обращаться с takes the instrumental case: с ним means “with him.” Its form changes depending on the person being treated, such as с ней обращались (“they treated her”) or с ними обращались (“they treated them”).
RU: С ним обращались как с членом семьи.
EN: They treated him like a member of the family.

Видимо, он убеждён, что я и моя семья плохо с ним обращались.

Apparently, he is convinced that my family and I treated him badly.

— Скрытое (2005)

Кто знает, как они с ним обращались.

Who knows how they treated him.

— Похитители велосипедов (1948)

Люди крайне расстроены тем, как с ним обращались.

People are extremely upset about the way he was treated.

— Жить (1952)