I am looking for opinions on whether a person should be charged petrol money and accommodation fees or not.
So the situation is, person A and person B agreed to go on holiday with each other and booked a holiday together last year. They paid half for the holiday itself and, because it involves person A driving them there, they of course agreed they would split the petrol money.
Months later, person C, who is a close family member of person A, is going through a tough time and was invited to tag along on the holiday as they live alone and are struggling.
There is now a debate as to whether person C should pay a third of the petrol money and a third of the accommodation costs.
Accommodation has already been paid in full between person A and B, so paying for accommodation would involve person C handing over cash to person A and B to make it so they have essentially all paid a third each. And petrol money would be split three ways on the days of travel.
So...
Should person C pay an equal share of accommodation and petrol?
Or should they not have to pay, because person A and B planned this trip a while ago and would be paying half regardless of whether person C attends or not.
Person C will not be increasing costs in any way as the accommodation has always been big enough for three people, as person A and B booked a large caravan. Person C has agreed that they will not be dictating what happens on the holiday or factored into any decisions or plans for the activities, as they are only going because they don't want to be alone right now.
Also, does it make a difference that person C is close family member of one of the original people?