So Judah told Onan, “It's your duty to marry Tamar and have a child for your brother.”
One day his elder daughter said to her sister, “Our father is old, and there are no men anywhere for us to marry.
or sister-in-law.
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?