These days there are so many issues with child abductions and custody battles it's good that there are safeguards in place. Another thing to think about if you are taking other people's children with you is to make provision for cash emergencies. Money and friends don't mix, so if the worst happened and you had to pay out a lot of money for someone else it could get awkward.

Better bring minors that are responsible enough to travel, in that way you will not bother yourself looking at their needs. You can also tell them to behave decently. Can you add those advices to your list?