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What to write after letter M on a wedding reply card? - missed wedding letter

Hello someone can help me with this ... I am at a wedding in a month, and I reply card. I do not know what to write to M
------------------ In the reply card. I understand you to Mr. or Mrs. Mrs.or there. But the problem is that the whole family attended the wedding, my father s mother, my sister n I. This is not complete, as to what Mr. pls help somebody!