What is the ruling on a wife insulting her husband's family and her husband?

A Muslim wife must respect her husband and treat him well, for this brings her happiness in this world and the Hereafter, and admits her to Paradise, as the Prophet, peace and blessings be upon him, said: "If a woman prays her five (daily prayers), fasts her month (Ramadan), guards her chastity, and obeys her husband, she will enter Paradise from any of its gates she wishes." This includes politeness in speech and conduct with her husband and his family.