" In addition to such mother-in-law violence toward a daughter-in-law, Burbank notes that “women aggress against their co-wives verbally in twenty-nine percent of the societies and physically in eighteen percent of the societies. Sisters-in-law also “aggress against one another in fourteen percent of the societies; mothers-in law and daughters-in-law are an aggressive dyad in twelve percent of the societies "

― Phyllis Chesler , Woman's Inhumanity to Woman