To make a long explanation short, my biological dad hasn't been there for me and my sister. He has wanted to be more of a friend to me than a dad and has not even tried to have a relationship with my sister.

He is a raging alcoholic who has been in and out of rehab/prison my whole life and just got out of prison in January. I haven't seen him since then and have only heard from him a few times.

My step dad married my mom in 2004 and we have had our differences, but I asked him to walk me down the aisle a few days ago and he cried happy tears and accepted.

Now, my dilemma is telling my bio dad and my grandma that he is walking me down the aisle. I don't know how to tell them that. I don't think my grandma will be mad at all, but I know my dad probably will be and will for sure be hurt and I hate hurting people.

What should I say??

Thank you in advance!!