Making last names plural? Addressing more than one sister-in-law? More than one Mister? We show you how to address them properly. Also, we investigate why we sometimes ask "How come?" instead of "Why?"\nLINKS AND SPONSORS |\nLearn how you can get my LinkedIn Learning course free: https://t.co/coQuXJRtrT |\nHallmark: https://hallmark.com/grammar\xa0Code: GRAMMAR |\xa0\xa0\nTeach for America: https://TeachForAmerica.org/grammargirl |\nGRAMMAR GIRL EMAIL NEWSLETTER |\nhttps://www.quickanddirtytips.com/newsletters |\nGRAMMAR POP iOS GAME |\nOptimized for iPad: http://bit.ly/iPadGrammarPop |\nFor iPad and iPhone: http://bit.ly/GrammarPopMobile |\nPEEVE WARS CARD GAME |\nhttps://www.thegamecrafter.com/games/grammar-girl-s-peeve-wars |\nGRAMMAR GIRL BOOKS |\nhttp://bit.ly/GrammarPopBooks |\nGRAMMAR GIRL IS PART OF THE QUICK AND DIRTY TIPS PODCAST NETWORK |\nVOICEMAIL: 833-214-GIRL (833-214-4475)