Including young children

Make all 3 of them ring bearers and have them walk down the aisle together.

I have 4 nephews and one niece! My 15 month old niece will be my flower girl, and my 4 nephews will be my ringbearers. My 5 year old nephew will pull a wagon down the aisle that my niece will be sitting in, my two 3 year old nephews are going to walk down with signs that say "It's okay ladies, we're still single", and my youngest nephew who will be 8 months old at the time of the wedding will either be held by my brother and sister-in-law as they go down the aisle or will be in the wagon too (if he can hold himself up then).