My advice to newbie homebirthers with older children is to always, always have someone there to care for their older child/children when they're in labor. Not just for the "just in case" factor, but because it's someone who can get them something to eat, play with them and keep them otherwise occupied if it's a long labor. I still feel this way.
We've always had someone to fill this role with our 3 previous homebirths. This is our 4th.
This time, there isn't an obvious person. I have a few possibilities, but not one person I feel really comfortable with.
The more and more I think about it, the more and more I think I want a quieter affair this time. Previously, I've never minded a bunch of people - last labor, I had 2 employees working in the lower level during the entire labor/birth! When finished, they stayed to help out with taking photos, grocery store run, playing with the kids, etc, and it was wonderful, but....
This time, I'm thinking dh, my MW and her assistant, and our kids will be just fine. My oldest will be 12 and I know she's perfectly capable of attending to the food/care needs of her siblings (9, 6 and 3) during a normal labor/birth. If there's a "just in case" scenario, I have a close neighbor, my parents or my MIL who could be here in 1-30 minutes. I just think I'd feel better having people "in the wings" vs. "in my face" this time.
Am I crazy to put this responsibility on my 12 year old who's not very comfortable with birth? Am I going to miss photos? I've always liked them in the past. What about hiring a professional who's not really involved instead? If the MW's aren't busy, I'm sure they'd snap some shots, but I want shots of the actual birth when everyone will be busy.