Is it just me or was Ben running away NOT Isabelle's fault at all?

Not only did he, as a 7 year old, no matter better than to run away (as was stated in the horseback riding scene,) but his 12 year old sister should've been watching him! 12 is old enough to babysit. I got paid to babysit other peoples' kids when I was 12. So the sister falling asleep was definitely her fault. Especially since Jackie knew that they would be accompanying Isabelle on her photoshoot. Jackie had to have known that if those kids are with her while Isabelle's working, the sister had to be the one in charge of making sure the boy didn't get lost, stolen or run off.