If you had 2 well behaved teenage girls of 15 and 17 would you be happy to leave them on their own for 2 nights? They have 2 sets of neighbours who can look in on them and they are able to cook simple meals on their own. Their parents are only going 2 hours away and they have family 30 mins away in case of emergencies.
Would any of you think this was a perfectly ok thing to do?