My parents were divorced when I was very young, and a family friend stepped in to take my father's place in my life. I still see this man as a father figure, more so one than my biological father. The other man who helped raise me is gay, and at this point in his life knows he isn't going to have any children, and sees my brother and I as his children instead. When I asked he agreed to walk me down the aisle, but I don't know how to break that to my biological father, who I DON'T want to walk me down the aisle. Period.
How do I tell my biological father that another man who did more raising of me is going to walk me down the aisle instead of him? -Ellie
Ellie, I think it's wonderful that you've chosen the man who you feel is a positive father figure in your life to walk you down the aisle. Walking someone down their wedding aisle is privilege, not a blood right — one that you feel this Other Dad clearly earned in his role raising you.
As for how to break it down for bio-dad, here's my advice…
I think the best tactic to use when telling bio-dad is to make it less about "You're not walking me down the aisle, Dad" and more about "I've chosen Other Dad to walk me down the aisle."
For all you know, your father may be relieved (some absent fathers find the whole thing awkward), but if he persists with questions — focus on the positive reasoning behind choosing Other Dad, rather than the negative reasons why you're not choosing bio-dad.
If bio-dad keeps trying to turn the conversation to "why not me?," keep focusing on the positives of why you chose Other Dad. Pick a particular shared memory with Other Dad to share with bio-dad (ie "I knew on one of my and Other Dad's mountain walks that this would be just right") instead of a negative against bio-dad (ie "You were hardly even around when I was growing up, Dad — of course I don't want you walking me down the aisle!")
Additionally, you could create a different role for bio-dad in the ceremony — he could do a reading or start the ring warming or lead a song. If you opt for this tactic, it's less about "I don't want you walking me down the aisle," and more about "I envision this other role for you instead."
The important thing is to focus less on what you're denying him, and more on why it feels important to you to honor Other Dad. If the conversation starts to slide off the rails, try some Copy 'n' Paste Conflict Resolution and politely end the conversation — ie, "While I wish I could change how you feel, I respect that we all have different opinions about weddings … and I hope you know that despite this disagreement, it doesn't change how much I love you! I'm so looking forward to seeing you at our wedding." *click*