Are the children of the second wife considered mahram (a relative one may not marry) to the first wife, who has been divorced, and to her mother?

Question:
Honorable Shaykh, may Allah grant you success. A man divorced his wife and then married another. Are the children of the new wife mahram to his divorced wife and to her mother?

Answer:
The children are mahram to his divorced wife. As for her mother, they have no relationship with her. Yes, her mother remains a mahram to the husband who divorced her for the rest of her life. As for the children, they have no relationship with her; they are not mahram to her. They are only mahram to his divorced wife. Yes.