Кто прав, кто виноват?

A certain Chumakov addressed the People's Judge Kavelin. He brought a statement of claim to his son, Sergey Gribanov, in which he demands care, love and alimony from him. Chumakov, who left his family when the boy was two years old, is now afraid to be alone, because Sergei's stepfather has become a real, loving father... Judge Kavelin has to figure out this difficult, but unfortunately, life-changing situation.