but really i assume you can do it however you want! its not like people are going to freak out if you would rather be on the opposite side, i think that most guests at weddings expect brides family left, grooms family right.
i always wondered (and especially after my own weddding) why the bride doesnt stand opposite her family/friends (and vice/versa with the groom) so the family and friends can see her face! my mom was in the front right corner seat, and she could only see the right side of my face and my back the whole time, and the opposite for dougs parents. wouldnt you want your family to see you, not your back? haha, i just always thought that was weird.