It could be that after the divorce, either the mother or older bro has saved up a bit on the side to do something together with the rest of the family, and hopefully make sure the the ones remaining stays together strongly. Getting a trip to a remote location sounds like the perfect getaway for the family to get closer and know what they will always have each other.<br/><br/>The younger siblings might have taken it worse, being a bit scared of what might happen now that mommy and daddy aren't together anymore, and feeling that the people around the leave them all to themselves. That might lead to them seeking comfort and closure in one another on their trip.