Als Lois Eltern völlig überraschend ihren Besuch abstatten, kommt es schon bald zu Problemen mit den alten Herrschaften: Dewey ist nur noch auf der Flucht, Malcolm wird von den Großeltern als Versager abgestempelt, Hal hat als Schwiegersohn ebenfalls nichts zu lachen - und mittendrin Lois, die versucht, sich irgendwie durchzulavieren. Nur Reese genießt den Besuch von Oma und Opa, denn er ist deren Liebling, bis plötzlich eine Handgranate im neuen Kühlschrank explodiert.
Lois's nightmare parents, Victor and Ida, come for a surprise visit and throw the family into turmoil not only with their mere presence, but by promising to pay for a much-needed refrigerator and then reneging after Lois and Hal spend money they don't have. Lois and Hal are forced to ask Ida and Victor to stay longer to help take care of the kids while they work some crazy overtime. Victor treats Reese like a king while Ida tortures Malcolm for being a smart wimp. Victor gives Reese a live grenade, and when Reese inevitably arms it, Malcolm's quick thinking blows up the new refrigerator instead of the whole house. Hal extorts money out of Lois's parents to pay for the damage. Francis motivates his fellow cadets to break out for a weekend and go to New Orleans for Mardi Gras, but then spend the entire time there suffering from eating bad sushi.
Lois fait un cauchemar : ses parents, Victor et Ida, lui rendent la vie impossible pour une histoire de réfrigérateur...
A casa arrivano a sorpresa i genitori di Lois, odiati da tutti tranne che da Reese; a causa loro Hal e Lois litigano, mentre Malcolm le prende da alcuni ragazzi. Francis invece convince i suoi compagni ad andare a New Orleans per il carnevale, ma è costretto a letto a causa di un'indigestione.
Os pais de Lois não aprovam seu modo de vida e tudo se complica quando visitam a família. Enquanto isso, Francis vai para Mardi Gras, mas não consegue chegar porque tem uma intoxicação por comida estragada.
Los padres de Lois visitan la casa. Víctor habla con Reese, en tanto que Ida molesta a Malcolm. Hal compra un refrigerador nuevo, que es destruido en un incidente con una granada de mano. Hal amenaza a los padres de Lois, pidiéndoles dinero.
