I personally do not have kids yet, but some of our employees have kids and even newborn babies. One of them just came back from a trip to Norway. It's all doable and probably less of a problem than people think :-)
I think they were asking you what do the parents in your organization do on some of these longer outings - do they come and bring their kids, come without their families, or stay home?
Got it! So I'd stay we've two groups of people in the company: those that like the freedom to spend it at home and those that like the freedom to go traveling. To answer your question: the retreats we offer are voluntary so not everyone joins. But we do have a group of people who are strong travelers and also having kids now and they just take them with them. This is however quite now to us and we're planning a trip to Martinique where we are considering hiring a nanny as well.
That's awesome. I think you're handling that really well. I suspect a lot of US-based startups use these things as a screening tool to not hire too many people with families/outside obligations. It's a perk on paper, but you're a "bad culture fit" if you can't do weekly happy hour or a week long retreat because you want to see your kids.