Since I don't know what level of indie film you are, (meaning no budget and unknown volunteer actors or with budget and SAG actors) I can tell you what I did last year on my no-budget, volunteer extra production.
I thought the best way would be to do all the kids scenes first even though it means a double trek round the forest.
Yes, get the kids out of the way first, especially if they haven't done this before. You will have to take more time with them and you can let your adult actors take more time going over lines and in costuming, etc.
If the kids are little, you said possibly a six year old, try to make it fun for them. If its a kidnapping, I'm assuming it will be a high drama scene, make it fun and okay to scream and kick or whatever you have them do. On my project, my kid actors were not actors, so I had to keep their interest and try to make it fun. I needed them to clap and sway back and forth. One kid got it, the other didn't. Try to keep up the energy and don't make too much of a deal if they get something wrong. Just ask them to do it over.
If the kid is older, you said eleven, they will probably understand what you want quicker and may give you good shots right off the bat.
Be clear on what you want, kids can lose interest quickly. Expect them to be kids and try not to get frustrated if they get it wrong. If you make it fun, they will probably have fun too.
On my project, we started out with 3 kids. One who was about four years old couldn't do what was necessary and his dad, the musician I was doing this for, took him out of the production. I didn't want to have any kids in the project, but he was paying for it so the kids stay in the production... with the exception of the four year old. But even when it wasn't working, I stayed "happy" and fun for the kids because if you don't, there's nothing to make them want to do it. (the other two were aged 6 and 8, also the musicians kids). Once it was over,
everybody gave them a round of applause and I thanked them for their help and sent them on their way. No way they were going to stay there for the 12 hours it took us to shoot.
In the end, I was happy, they were happy, the musician was happy and the production was a success.
-- spinner
