But she replied, “My daughters, why don't you return home? What good will it do you to go with me? Do you think I could have more sons for you to marry?
Judah did not want the same thing to happen to his son Shelah, and he told Tamar, “Go home to your father and live there as a widow until my son Shelah is grown up.” So Tamar went to live with her father.
Suppose two brothers are living on the same property, when one of them dies without having a son to carry on his name. If this happens, his widow must not marry anyone outside the family. Instead, she must marry her late husband's brother, and their first son will be the legal son of the dead man.