Getting married abroad no children allowed at ceremony?!

Hi I'm getting married next year abroad and I have decided that I don't want children there. When I first suggested it amongst my friends with children said that it was fine but my family are making it a problem as my sister is pregnant and having her baby before my wedding, is it rude for me to expect her to not attend with the child, I'm not being funny but my nephew has a dad so why can't he babysit in the hotel. -There are no children under 13 attending except fiancé nephew who will be 7 and is a page boy. - I don't want babies crying during my ceremony and my reception is basically going to be a party. I know people may say blood is thicker than water and all that but my husband to be will be new family and this is my day to celebrate my future life with him and it needs to be what I want(he just wants me to be happy) Am I wrong? Some advice please Anne

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