《礼记·丧服小记》
如果是为娘家的父母服丧，有下列几种情况：如果是在练祭之前被丈夫休弃，那就应该和自己的娘家兄弟一样服丧三年；如果是在练祭之后被丈夫休弃，因为本应服的期丧已经服满，就不须要再为父母服丧；如果是在练祭之前又被丈夫召回，那就按常规为父母服期？
九月七月之丧，三时也；五月之丧，二时也；三月之丧，一时也。故期而祭，礼也；期而除丧，道也。祭不为除丧也。三年而后葬者必再祭，其祭之间不同时而除丧。
If you are mourning for your parents in your natal family, there are the following situations: if you are divorced by your husband before the practice ceremony, you should mourn for three years like your brothers and sisters in your natal family; if you are divorced by your husband after the practice ceremony, since the mourning period that should have been served has been served, you do not need to mourn for your parents again; if you are recalled by your husband before the practice ceremony, you should mourn for your parents according to the conventional period?