Does a divorce occur when a husband says to his mother about his pregnant wife: "She will not be silenced unless you tell her she is divorced," with the intention of threatening, not divorcing?

Divorce does not occur through a mere promise or a threat of it. Therefore, the statement "She will not be quiet unless I tell her she is divorced" does not constitute a divorce. It is advisable to avoid using divorce-related words as a threat and to resolve disputes with wisdom.