Genesis 38:11 - Back Home: Used, Childless & Widowed

Then said Judah to Tamar his daughter in law, Remain a widow at thy father's house, till Shelah my son be grown: for he said, Lest peradventure he die also, as his brethren did. And Tamar went and dwelt in her father's house

Tamar went and dwelt in her father's house as this was the custom for widowed women without children (Leviticus 22:13; Ruth 1:12-13). However, Reuben was lying; he had no intention of allowing Shelah to marry Tamar.