Does the divorced husband of a divorced sister, who has three daughters under the age of seven and for whom he provides no maintenance, have the right to take custody from her if she remarries?

If a mother is divorced and has young children under seven years of age, their custody belongs to her as long as she does not remarry. If she remarries, her right to custody is forfeited. The father must provide for his children if he is able to do so; if he refuses, he is sinful. The wife can compel him to do so through legal means. The best interest of the child in custody must be considered when determining who is entitled to custody. If the mother neglects her children or the father neglects them, the judge is the one who determines what is best for the children.