DD1 (11yo) is going away for the weekend with her best friend and her parents. They've been given a caravan for free for a couple of days so it's a 'free' holiday as such but obviously there will be costs involved in terms of petrol, food, ice cream, treats etc.
I want to give the parents some money to cover such costs but I'm not sure how much would be a acceptable to give them? They are going tomorrow night and coming back on Sunday. How much do you think I should offer? Also, how much spending money should I give DD1 for 2 days?