Daily useful Masae'l for fasting

1749. It is haraam for a wife to keep a Mustahab fast if by so doing she would not be able to attend to her duties to her husband. And the obligatory precaution is that even if she can attend to her duties towards her husband, she should not observe a Mustahab fast without his permission.

1750. It is haraam for the children to observe a Mustahab fast if it causes emotional suffering to their parents.

1759. It is Mustahab that a person breaks his fast after offering Maghrib and Isha prayers. However, if he feels terribly inclined to eat, so much that he cannot concentrate on the prayers, or if someone is waiting for him, it is better that he should break his fast first and offer the prayers later. However, as far as possible, he should try to offer the prayers during the prime time (Fadheelat).

1757. ...If a person observes a Mustahab fast, it is not obligatory on him to complete it. In fact, if one of his brethren-in-faith invites him to a meal, it is Mustahab that he accepts the invitation and breaks the fast during the day time even if it may be after Zuhr.