If a levir who was a minor cohabited with a sister-in-law who was a minor, they should be brought up together. If he cohabited with a sister-in-law who was of age, she should bring him up until he is of age. If a sister-in-law declared within thirty days [after her Levirate marriage], `He has not cohabited with me`, [the levir] is compelled to submit to her halizah, but [if her declaration was made] after thirty days, he is only requested to submit to her halizah. When, however, he admits [Her assertion], he is compelled, even after twelve months, to submit to her halizah.

 יבמות 13.12 
יבם קטן שבא על יבמה קטנה, יגדלו זה עם זה; בא על יבמה גדולה, תגדלנו׃ היבמה שאמרה בתוך שלושים יום, לא נבעלתי-- כופין אותו שיחלוץ לה; לאחר שלושים יום, מבקשים ממנו שיחלוץ לה׃ ובזמן שהוא מודה-- אפילו לאחר שנים עשר חודש, כופין אותו שיחלוץ לה

If a woman vowed to have no benefit from her brother-in-law, the latter is compelled to submit to her halizah, [if her vow was made] during the lifetime of her husband, but if after the death of her husband, the levlr may only be requested to submit to her halizah. If this, however, was in her mind [even if her vow was made] during the lifetime of her husband, the levir may only be requested to submit to her halizah.

 יבמות 13.13 
הנודרת הניה מיבמה-- בחיי בעלה, כופין אותו שיחלוץ לה; לאחר מיתת בעלה, מבקשין ממנו שיחלוץ לה׃ אם נתכוונה לכן-- אפילו בחיי בעלה, מבקשין ממנו שיחלוץ לה