Vicious proverbs on the mother-in-law

1.There once was a good mother-in-law but the wolf gobbled her up.-French proverb
2.Mother-in-law and daughter-in-law can be cooked together but they will never be tender.-French proverb
3.Every mother-in-law is a piece of the devil's pants.-French proverb
4.A mother-in-law made of sugar,still tastes bitter.-Catalan proverb
5.A mother-in-law may be good,but she is better when mother earth covers her up.-Catalan proverb