Interracial Wedding Advice

I am getting married next June to the most amazing man ever~ Only issue with some people is I am white and he is black. I honestly thought that the race issue would be minimal compared to what is was when I was young. I feel like I am a grown woman and what I chose to do in my life does not affect any tom dick or harry. My grandmother was very mad at me when I first dated outside my race but she has come around and realized that she was wrong. To make a long story short I have a cousin that has two children...his oldest was my sisters flower girl so I just thought it would be fitting to ask both to be the flower girls in mine.....well my aunt called and siad they wouldnt be able to make it to the wedding bc they didnt agree.....so what do i do now...send them an invite anyway bc of ettiquite? or x them completely out of my life??? any suggesti