There was no need for civil government in the Garden of Eden. Everyone obeyed God, so there was no conflict. Sin had not yet entered in, so there was no theft or violence. Human government was not needed.
Once Adam and Eve sinned, crime and violence became a problem. Initially these problems were dealt with by families. Fathers are required to teach their children to obey God and live in harmony with each other. They must provide for their children and resolve disputes between them. This is family government.
Abraham is a good example of family government. He was a very effective leader of his family. He protected them when they were attacked. He maintained harmony with family members.
But even Abraham got it wrong at times.