What is the ruling on children refusing their elderly mother's marriage to a man they do not know, especially since she threatens them with not forgiving them if they do not agree?

If a widow wishes to marry a righteous man, her guardian is obligated to marry her off, and no one is permitted to prevent her. There is no distinction between an older or younger woman, or one who has children or does not; because marriage fulfills many benefits for a woman. Therefore, inquiries about the suitor must be made, and if he is pleasing in his religion and character, then she must be married off to him.