From the FAQ:
We have had people with kids here and it has worked great. And we have had people with kids here and it was a mess. So I guess it thoroughly depends on you and your kids.
The first element to figure out: With one person, there is 1 unit of work and 1 unit of resources consumed. With a couple with three kids, there is one unit of work and 5 units of resources consumed. We did have a lovely family of five here last year, and it worked great. The deal they worked out was that they would provide all of the food for all five people. The parents took really good care of the kids and the kids were super respectful.
And we have had people that thought my house was "unsupervised child storage" and the children would destroy my house and the parents would say "yeah, kids do that - you should child proof your house."
So it sounds like you are bringing two kids. One is 4 and one is 15. So at the very least, you or the 15 year old can entertain the 4 year old while one person is doing bootcamp stuff. But it is possible that you and the 15 year old will do booty stuff while the 4 year old does micro booty stuff. Or can be self entertained with a mud puddle or something.
We just can't tell until we are hip deep in the experience.
So the starting point is for me to ask you the question: what do you propose?