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I would keep it simple (because the kids will be flat out so it will make it easier to have everything cut up and prepared before you get there) with grazing platters and add things like kabana, twiggy sticks, ham, salami, cheese, dip/ biscuits, watermelon, grapes, mangoes, apricots, crackers, dried fruit, chicken kebabs, nuts, pork rind, popcorn, carrot sticks, grape tomatoes, baby cucumbers, corn chips/ salsa or guacamole, pretzels.
You could even do a dessert platter for a treat with chocolates, lollies, cookies, cake, slices, christmas balls, cups of mousse, chocolate dipping sauce with strawberries etc.
For breakfast you could do pancakes/ waffles or buy a multi packet of individual serves of cereal.
Also the dessert ideas are nice but not cheap
If they’ve got bbq facilities I’d keep it simple - sausage sandwiches. Watermelon and Christmas sweets, maybe some treat soft drink.
I just want to say I love your plan.
Just do cold meat and salad before you go with a dip tray for snacks and something good and easy for dessert. Whatever you do just make sure it's as 'done' and disposable as possible before you go. Any prep that needs doing will mean taking more stuff with you and then taking it on your holiday with you.
Cold meat , chook, salad, crunchy cold salad and veggie dip snacks, some treats, chook and coleslaw and soft white bread rolls yum haha or if you are trying for traditional pick uo a chook etc at woolies or red roster