Wedding questions about children participants and who walks me down the aisle.....?

First of all, I have two 5 yr old brothers, one 4 yr old brother, and a 3 yr old sister along with a godchild (boy 2 years old). I don't know how to use them all in my wedding because it seems like that will be too many kids. Not to mention it will be a two race wedding and I would like to incorporate my fiance's family also. ANY SUGGESTIONS???? Also, my dad and I aren't really close but we have a good relationship and my step dad has been there for me for a really long time. Would it be weird to have them walk me down the aisle together? They get along really well but I am worried that I will hurt my dad's feelings. What do you guys think?