Weddingbee boards

So I am having my little brother walk me down the aisle. I didn't think my dad would mind. This is my 2nd wedding and he walked me down the first time - also he didn't care to walk eithe of my sisters down in their weddings. So I didn't think it was a big deal. Until I told him. He got so upset. I panicked and then asked if he'd do a reading.  He asked if he could ad-lib.  Now -not a good idea for me to ask my father to read at the ceremony and now that he wants to ad-lib, this will be a disaster! How can I get out of this?  How do I give him another "job" or part in the wedding so he doesn't feel bad, but can't do anything to embarrass us during the ceremony?  I'd like him to just sit down, watch the ceremony quietly and then head to the reception.  Any ideas? 

My brother is super excited to have just him walk me down the aisle and the relationship between my dad and I has been tumultuous.  I'd hurt my brother's feelings if my dad walked too b/c they don't like each other. If my brother couldn't do it I was going to walk down on my own.  He hasn't expressed any interest in this wedding nor offered to help in any way with it. So I didn't feel he should be involved - that is until he was visibly upset by my choice.   I like the unity candle idea - he could present that.