Ring Bearer/flower Girl/kid titles!

So for our flower girl, I picked my goddaughter (also only little girl we know currently so it worked out!). For our ringbearer, my fiancé wanted to pick his godson (which makes sense since I picked by goddaughter). HOWEVER. His godson will be 2 at the wedding and has a brother that will be 3.5, ideally they would walk together.. the monkey wrench here is my best friends son (my honorary nephew). I'd like to incorporate him somehow, walking with my flower girl makes sense but I don't know what all these kids titles should be! These 4 kids are so important to us so I want to include them.. any ideas are appreciated!!