I will be walking alone down the aisle as well, I considered my styepfather my dad, he was killed six years ago, my biological father I never considered, although I am very close with my grandparents and rest of his said of family, I am not close with him, neither of my brothers will be able to make it or I wouldve had one of them walk me down the aisle, and personally in my own opinion, I don't like when mothers walk their daughters down the aisle (all though I am extremely close with my mom) I want my mom to be able to watch me walk down the aisle and have that memory. In any case you could start the discussion with, since we arent having a tradtional wedding, we are doing somethings a little untraditionally...etc