Part 3: Contraception and the Catholic Church
Levirate Law: The Duty of Brothers
"When brothers live together and one of them dies without a son, the widow of the deceased shall not marry anyone outside the family; but her husband's brother shall go to her and perform the duty of a brother-in-law by marrying her. The first-born son she bears shall continue the line of the deceased brother, that his name may not be blotted out from Israel. If, however, a man does not care to marry his brother's wife, she shall go up to the elders at the gate and declare, . . .