I am very new to narrating. We have only used it a few times and it was disasterous!

My question is: how do you handle narration with two kids? Do I have the younger one start first and then the older one add more detail? In my family my younger one is the detail oriented one and my older one is the one who misses quite a bit.
I have a friend who has her kids narrate one at a time to her in another room. I really didn't want to do that if I could help it.
What are your suggestions?