My Brother And Sister Are NOT INVITED

Hi all.....I am getting married here in a month...and I did not invite my sister and my brother. I feel really bad about it...but there is such tension between my siblings and my parents that I felt for the best interest of our special day...that they were not to get invitations. I love them both...but I feel extremely guilty. I am trying to avoid them right now, so I don`t blow it. I really can`t have them come because I know there will be some sort of disruption. Any one think I am a misrebale old bat of a sister for not inviting them?????