@Mark116
Yes, you are probably right. I just felt it odd that someone travelling long distance with two minors might mention the reason, e.g. "I'm taking my god daughters on holiday," or whatever. I could have tried to get this information out of her, but didn't want these guests anyway, also for the reasons you mention.
I was SO annoyed when she changed the booking to 2 adults and tried to IB again, after I had firmly told her, NO, NO, NO. Her attitude seemed to be that it was not my choice who stayed in my house but hers. I'm a live in host for pete's sake! Honestly, the nerve of some people.
When I still hosted short-term guests, I often got requests from parents travelling with their children. They would try to persuade me to make an exception and some got really angry, even abusive, when I turned them away, even though it's clearly stated on the listing. I had to change the wording to "I do not accept under 18s under any circumstances."